Question: There are 27 students on the debate team. What is the
probability that at least 3 of them have their birthday in the same
month.
From inspection, we can understand that as there are more than 24
students ( 2 x 12 for months), there will be 3 students extra who will
have to share their birthday with the any of the others, so the chance
is 1.
I am looking for the mathematical equations for this.
How does 'at least three' of them share the birthday translate to in
this?
