# Happy birthday number 1

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Please use ide. Let us discuss the generalized formula. Python3 code to approximate number. Returns approximate number of. Ceiling Math.

Write find 0. Also, let's assume that a person has an equal chance of being born on any day of the year, even though some birthdays may be slightly more likely than others.

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That will simpify the math, without changing the result signficantly. To find the probability that both people have this birthday, we have to multiply their separate probabilities. Things are getting complicated fast. Four or five people would be even messier.

### Number one today, October 08 12222

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. 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:.

Again, the first person can have any birthday. The second person's birthday has to be different. That leaves birthdays out of 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:. If we want to know the probability that four people will all have different birthdays, we multiply again:.

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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. 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.

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5. The easiest way to find the right class size is to use a calculator to try different numbers in the formula. The probability is about Suppose you flip a coin and bet that it will come up tails.