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25 September, 09:15

Jill is inviting friends for

a party, She doesn't know

any of their birthdays. What

is the least number of friends

that she needs to invite in

order to guarantee that at

least a of the friends will

I have a birthday in the same month?

+3
Answers (1)
  1. 25 September, 09:31
    0
    13.

    Step-by-step explanation:

    If each of the first 12 guests happens to be born in a different month, the 13th person will have to be born in the same month as one of the first 12.
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