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if there are 25 people, what is the likelihood that at least one of them is born in each month of the year?

not any formula I can think of, sorry

I have tried everymethod, consider number of month that not contain birthdays, consider allocate the extra 13 people to 12 months. But none of these works. And I am now really confuse.

Any help would be very generous!

Thank you!

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# Probability that seems easy but not!

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