### Home > INT3 > Chapter 10 > Lesson 10.3.1 > Problem 10-144

10-144.

FINDING BIRTHDAY TWINS

If you randomly select a group of just

Determine the number of possible unique pairings in a group of

people. Unique pairings refer to the number of combinations of

. Compute the probability that any given pair of people have the same birthday (ignoring leap day).

Compute the probability that any given pair of people

*do not*have the same birthday (ignoring leap day).See part (b).

Now compute the probability that exactly one pair out of the

people has the same birthday. Use the answers from parts (a) – (c) to determine the probability.