Question

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?​

Answer 1

Answer:

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.