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Assume that a person chosen at random is equally likely to have any birth month

Mathematics
Tutor: None Selected Time limit: 1 Day

How many people do you need in a room to be certain that two of them were born in the same month?

How many people do you need in a room for it to be more likely than not that two of them were born in the same month?

Apr 9th, 2015

The probability of any any one person having any one birth month is 1/12; or one out of 12

the probability of any two people having the same birth is only 1/12*1/12 =1 /144 so the probability that two people will share the same birth month is only one out of 144.

However, and here is the reason why it is stupid to think that playing the lottery by more tickets increases the your chances of winning, YOU ARE NEVER CERTAIN.

Let me give you a simple example:

If you flip a coin, the probability of getting heads or tails is always 1/2. But there is no certainty, no matter how many times you flip the coin. If you flip the coin 100 times you should get heads or tails about 50 times, but there is no guarantee. 

I hope this helps.

Apr 9th, 2015

Sorry for the bad grammar, I hope you are able to see through it.

Apr 9th, 2015

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Apr 9th, 2015
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