Birthday Present

Math Forum: Ask Dr. Math FAQ: The Birthday Problem -- Ask Dr. Math: FAQ The Birthday Problem Dr. Math FAQ || Classic Problems || Formulas || Search Dr. Math || Dr. Math Home Suppose you flip a coin and bet that it will come up tails. Since you are equally likely to get heads or tails, the probability of tails is 50%. This means that if you try this bet often, you should win about half the time. What if somebody offered to bet that at least two people in your math class had the same birthday? Would you take the bet? This question is more complicated than flipping a coin, because the chance of finding two people with the same birthday depends on the number of people you ask. If there were only one other person in your math class, you might be surprised to find out that she had the same birthday as you. If there were a pair of people with the same birthday in a class of 366 people, would you still be surprised? How large must a class be to make the probability of finding two people with the same birthday at least 50%? Let's forget about leap year when we solve this problem (no February 29 birthdays!) This way, we can assume that a year is always 365 days long. We'll start by figuring out the probability that two people have the same birthday. The first person can have any birthday. That gives him 365 possible birthdays out of 365 days, so the probability of the first person having the "right" birthday is 365/365, or 100%. The chance that the second person has the same birthday is 1/365. To find the probability that both people have this birthday, we have to multiply their separate probabilities. (365/365) * (1/365) = 1/365, or about 0.27%. Now, what about three people ? The chance of the first and second person sharing a birthday is still 1/365. The first and third person might share a birthday instead. The probability of that is 1/365 as well. But what if the second and third person shared a birthday? And what if all three of them had the same birthday? Things are getting complicated fast. Four or five people would be even messier. Is there a simpler way? To solve the birthday problem, we need to use one of the basic rules of probability: the sum of the probability that an event will happen and the probability that the event won't happen is always 1. (In other words, the chance that anything might or might nothappen is always 100%.) If we can work out the probability that no two people will have the same birthday, we can use this rule to find the probability that two people will share a birthday: P(event happens) + P(event doesn't happen) = 1 P(two people share birthday) + P(no two people share birthday) = 1 P(two people share birthday) = 1 - P(no two people share birthday). So, what is the probability that no two people will share a birthday? Again, the first person can have any birthday. The second person's birthday has to be different. There are 364 different days to choose from, so the chance that two people have different birthdays is 364/365. That leaves 363 birthdays out of 365 open for the third person. To find the probability that both the second person and the third person will have different birthdays, we have to multiply: (365/365) * (364/365) * (363/365) = 132 132/133 225, which is about 99.18%. If we want to know the probability that four people will all have different birthdays, we multiply again: (364/365) * (363/365) * (362/365) = 47 831 784/ 48 627 125, or about 98.36%. We can keep on going the same way as long as we want. A formula for the probability that n people have different birthdays is ((365-1)/365) * ((365-2)/365) * ((365-3)/365) * . . . * ((365-n+1)/365). If you know permutation notation, you can write this formula as (365_P_n)/(365^n). That's the same as 365! / ((365-n)! * 365^n). We've made some progress, but we still haven't answered the original question: how large must a class be to make the probability of finding two people with the same birthday at least 50%? We know that the probability of finding at least two people with the same birthday is 1 minus the probability that everybody has a different birthday, and we know how to find the probability that everybody has a different birthday for any number of people. The easiest way to find the right class size is to use a calculator to try different numbers in the formula. It turns out that the smallest class where the chance of finding two people with the same birthday is more than 50% is... a class of 23 people . (The probability is about 50.73%.) From the Dr. Math archives: Probability Theory: Coincidental Birthday Probability of the Same Birthday within a Group Birthday Probabilities Three Share a Birthday The Birthday Problem; Queuing at a Bank Birthday Probability, Class of 25 One Person of Seven Born on Monday Odds of Left-Handedness in a Group From the Web: The Birthday Problem: A short lesson in probability , George Reese A Java applet that you can use to test different class sizes (it works better with small classes) and graphs of the probability for different numbers of people. The Law of Small Errors , Keith Devlin The birthday problem, and related questions - what's the probability that someone will have your birthday? Birthday Surprises, Ivars Peterson Birthday Problem, Eric Weisstein's World of Mathematics Coincidence, Alexander Bogomolny How to Read Mathematics, Shai Simonson and Fernando Gouveau This article uses an explanation of the birthday problem as an example. An Introduction to Mathematica and the "Birthday Problem," Louie Beuschlein For a general review of probability: Probability, Dr. Math FAQ Probability in the Real World, Dr. Math FAQ - Ursula Whitcher, for the Math Forum Submit your ownquestion to Dr. Math [ Privacy Policy ] [ Terms of Use ] Math Forum Home || Math Library || Quick Reference || Math Forum Search Ask Dr. Math ® © 1994-2005 The Math Forum http://mathforum.org/dr.math/

creative gift ideas! Welcome

Find Unique Gift Ideas and Creative Gifts - FindGift.com Personalize FindGift.com! -- Login | Sign Up | List of Services Gift Ideas Gift Registry Gift Shops Gift Bookmarks Home | Help keyword search Gift Giving Made Easy! A free service dedicated to helping you find creative gift ideas! Welcome to FindGift.com! Looking for someone's gift registry, click here . Gifts by Occasion Anniversary Baby Shower Baptism Bar Mitzvah Bat Mitzvah Birthday Breakup / Divorce Confirmation Family Reunion First Communion Graduation House Warming New Baby Promotion Retirement Wedding Who is the Gift for? Her Him Couple Baby Toddler Child Pre-Teen Teenager for a Pet Client Teacher Express Yourself Cheer Up Congratulations Crazy for You Get Well Girl Power Good Luck I Love You I Miss You I'm Sorry Let's Party Sympathy Thank You Thinking of You Gifts by Type Romantic Personalized Unique Sentimental Wacky Humorous Fashionable Cosmopolitan Spiritual Trendy Healthy Relaxing Inspirational Geeky Advanced Search Gift Finder Gift Wizard FindGift.com helps you find unique gift ideas and connects you to online stores where these gifts are sold. We search the web to bring you great gift ideas! Try our Gift Wizard our newest gift finding technology Gifts in the Spotlight Day You Were Born Newspaper Brainy Baby Bouquet Gift Basket Gift Ideas by Category Gift Baskets • Care Packages , Bath & Body • Healthy , Sports Theme • for Kids , for Teens , for Babies All Gift Baskets Keepsakes • Family Heirlooms , Memory Boxes • Photo Albums , Picture Frames • Journals , Poetry , Memorials All Keepsakes Bridal Party • Bridesmaids , Groomsmen • Maid of Honor , Best Man • Flower Girl , Ring Bearer , Parents All Bridal Party Special Themes • Hearts , Celestial , Zodiac • His & Hers , Gag Gifts • Summer , Special Causes All Special Themes Regional Gifts • French , Italian , Irish • Japanese , Hawaiian • NYC , Las Vegas , Hollywood All Regional Theme Occupational Gifts • Firefighter , Police , Military • Doctor , Dentist , Nurse • Coach , Hairdresser All Occupational Theme Tasty Gifts • Wines & Spirits , Coffee , Tea • Retro Candy , Cookies , Popcorn • Seafood , Meats , Breakfast All Food & Dining Flowers & Plants • Sunflowers , Lavender , Lilies • Bonsai Trees , Bamboo , Herbs • Plant Stands , Balloons All Flowers & Plants Jewelry • Bracelets , Lockets , Anklets • Personalized , Beaded , Children's • Jewelry Boxes , Watches All Jewelry Gift of the Month Clubs Gift Certificates Additional categories: Apparel , Baby Gear , Bath & Body , Collectibles , Collegiate , Eco-Friendly , Electronics , Exercise & Wellness , Household , Leisure , Office , Outdoors , Party Supplies , Patriotic , Pets , Religious , Senior Gear , Sports & Recreation , Toys , Yesteryear , See all Additional Services In addition to providing unique gift ideas, we also offer many free services for members, shown below. Sign-up Now! to use our FREE services! Gift Registry Free Gift Registry Create your own personal gift registry. Register for any item, from any store, for any occasion. Find the gift registries of your family and friends. Gift Bookmarks Free Gift Idea Bookmarks Ever find the perfect gift idea for someone, but their birthday was months away? Now, with FindGift.com bookmarks you can easily remember the gift ideas that you have for other people. Email Reminders Free Email Reminder Service Provides timely email reminders for a birthday, anniversary, and other special occasions. Sign-up Now! Bosses Day Oct 16, 2005 24 Shopping Days Left Bosses Day Gift Ideas Sweetest Day Oct 15 Halloween Oct 31 More Holidays Seasonal Gifts Wedding Gift Ideas Anniversary Gift Ideas Autumn Theme See this month's Top 20 Gift Ideas Gift Helpers » Anniversary Gifts » Flower Meanings » Monthly Flowers » Monthly Birthstones » Signs of the Zodiac » Additional Resources FindGift.com Newsletter Sign up to receive seasonal and unique gift ideas via email. Email Address Merchant Login | Add Your Products to FindGift.com | Press Room | FAQs | Contact FindGift.com Conditions of Use | Privacy Policy | Site Map © 1997-2005, Registry Online, Inc. FindGift.com and its logo are trademarks of Registry Online, Inc.

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Housewarming gifts SY L.com > Online Dating Service > Flowers & Gifts > Popular gift ideas > Housewarming gifts Dating Photo Personals Meet singles Personal Ads Tour Join Articles Login Housewarming gifts Flowers & Gifts Your personal gift guide Gift aid Art of gift giving Choosing a perfect gift Gift packaging Gift wrapping Gift bags & boxes Gift cards & tags Popular gift ideas Thank you gifts Charitable gifts Baby & kids gifts Gifts for him Gifts for her Romantic gifts Religious gifts Get well gifts Party gifts Housewarming gifts Adult Gifts Sympathy gifts Gifts for friends Gifts for teens Business gifts Holiday gifts Graduation gift Easter gifts Valentines day gift Mothers day gift Fathers day gift Christmas gift Birthday gift Anniversary gift Bouquet & Arrangement Mothers Day Flowers Valentines Day Flowers Birthday Flowers Sympathy and funeral flowers Easter flowers Wedding flowers Flower language Exotic flowers Gerber daisies Carnations Tulips Roses Flowers & plants House plants Dried flowers Garden flowers Fresh cut & artificial flowers Flower market variety Seasonal flowers Flower delivery services Wholesale flowers Housewarming gifts Your friends or relatives are moving into a new house, and youre invited on the housewarming. Of course, guests arent supposed to come with empty hands, and the case is rather special. So you face a problem of a housewarming gift. A lot of different traditions are connected with moving into a new house. Some of them are very ancient, about most we dont know, and even less we follow. The times have changed a lot and so have done some of those traditions. Nowadays housewarming gifts arent supposed to be massive and expensive, as they were used to be before. But they should be useful. As well as in case of celebrating marriage, you are welcome to ask the hosts if they need anything on their new place. Nowadays its normal to present money, though it could be taken as offence in the previous centuries. Still you can present some symbolic housewarming gifts. It can be a figure of a household ghost, who is supposed to conjure evil away. There existed a tradition to let a cat or a cock into a new house first. So cats, cocks, hens and dogs are considered to be the keepers of a new home. Nobody expects that you will bring the whole zoo with you on the housewarming, but you may present some statues, figures and toys, shaped like these animals, or nicely decorated pictures with their images. Another ancient tradition is to hang a horseshoe, found on the road, over the door. So anything, that reminds of a horseshoe or has its shape, presented as a housewarming gift, will show the hosts that you wish they felt comfortable on the new place.. The prosaic, but useful gifts, like kitchen towels, set of glasses, frying pens, set of utensils, a small carpet in the corridor, bad-clothes wont excite a hostess too much. But you can be sure that already next day she might remember you in the warmest words. If you wan to give something both nice and useful, you may choose some original vases or wall clocks. Always keep in mind that humble but long-lasting gifts are much better, than a bunch of roses which will be thrown away by the end by the week. Online Dating Service · Photo Personals · Meet singles · Personal Ads · Directory · Dating Site · Dating advice · Articles Privacy Statement | Terms of Use | Site Map | Contact Us | Report a Bug © 2004,2005 SearchYourLove TM partners sites: Great Holidays and Hotels // Health and Beauty Journal // MotorListing // Millennium Rise // EstateIndex // Russian brides // Mail order brides // Casino journal // Dating & Personals // Admotor Russian brides // Gambling online // Mail order brides // Admotor // Millennium Rise // MotorListing // EstateIndex Great Holidays and Hotels // Health and Beauty Journal

Housewarming Gifts Articles Ice

Good Housewarming Gifts - Gifts BW gifts | gifts Resources | Add URL Wine Gifts & Baskets From the casual wine drinker to the serious enthusiast, we have a gift that will make them smile. Our selection includes premium wine, gourmet baskets, distinctive champagne sets & the very finest California and Northwest wines. Good Housewarming Gifts Articles Ice Cream Sauces Add one of these to your ice cream to make it a complete dessert, from your About.com Guide...( Continue Reading ) Housewarming Gift Ideas: Continued Here are our favorite, and not so favorite gift ideas for housewarmings....( Continue Reading ) Housewarming Gift Ideas Moving into a new home is a time that's full of possibilies, and we often share in the excitement by taking a housewarming gift to the new homeowners. But what should you give? Here are our favorite, and not so favorite gift ideas for housewarmings....( Continue Reading ) A Housewarming Party A party plan for hosting a Housewarming Party with recipes and menu ideas....( Continue Reading ) A Housewarming Party A party plan for hosting a Housewarming Party with recipes and menu ideas....( Continue Reading ) Good Housewarming Gifts Directory Links hot holiday gifts things remembered personalized gifts retirement gifts for teachers coaches gifts organic baby gifts custom baby gifts gifts for 50th wedding anniversary 25th wedding aniversary gifts handmade mothers day gifts graduation gifts for girls ideas for mothers day gifts best christmas gifts 2002 valentine day gifts for guys gift baskets of delaware cheap gifts for guys gifts 2 india wicker storage baskets recipes for food gifts personalized golf gifts five year anniversary gifts online gifts to india 2nd anniversary gifts homemade teacher gifts gifts for father gift baskets cheese spiritual gifts from god birthday gifts by mail gift baskets chocolate japanese garden gifts anniversary gifts 10 year gifts for a girlfriend graduation gifts for nurses christmas gifts for mothers gifts for little girls gift baskets las vegas great grandmother gifts sterling silver baby gifts baskets gifts homemade wedding gifts beneva flowers and gifts gift baskets of texas biblical spiritual gifts bridal attendent gifts wholesale christmas gifts gift baskets for delivery Popular Search Terms: Gifts BW © 2004 Gifts BW All trademarks are the property of their respective owners. All Rights Reserved. This site is not related to Brajeshwar or Brajeshwar.com in anyway, shape or form