2011 AMC 10B Problems/Problem 11
There are 52 people in a room. The statement " At least n people in the room have birthdays in the same month " is true for n. What is the largest possible value of n?
(A) 2 (B) 3 (C) 4 (D) 5 (E) 6
By the Pigeon Hole Principle, this the 52/12 rounded up. That is 5 (D).