55 = 4f + 3
f = 52/4
f = 13
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It is partially dependent on how many friends you have. With 6 friends, the chance is over 77% that two of them will have a birthday in the same month. If you search "birthday problem" you will find many very detailed descriptions of how the formula works.
I believe you can celebrate a birthday party when you think you and your friends and family can agree on a time that works for you all! My son has a summer birthday and with everyone being on vacation it's too hard to see who will be in town and who won't. We have recently decided to do end of the year parties that celebrate his early august birthday and the beginning of summer time! So fun that he gets to celebrate with all the friends he's made this school year, hope that helps!
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Believe it or not it happens very often for example three generations of women in my family have the same birthday i am the third generation I've seen it a lot more too so the odds are high. I agree, I am born on my mother's birthday and in school I had several friends who were also born on their mother's birthdays.
John got 8 books for his birthday. He hated reading, so he decided to give all of his books away to his friends. He realized that if he gave anyone a whole book, then that would be a nasty thing to do, because his friend might get interested in the book even though all of his friends also hated reading, just like John. So he decided to give his friends only 3/4 of a book each. That way, none of his friends would be in danger of getting sucked into reading a whole book. How many of John's friends could he give bundles of loose pages from his 8 books ?