Greetings:
The probability that out of 13 people in a room, 2 will be born in the same
month is 13/24.
     There are 78 ways of selecting groups of two out of a total of 13. The
probability that any 2 people in any selected group share the same month of
birth is 1/12 x 1/12 or 1/144. Therefore
the probability that 2 people out of 13 will share the same birth month is 78
x 1/144 or 13/24.
          Peace!
                      Amat

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