P-1.3 :  The birthday paradox says that the probability that two people in a room
will have the same birthday is more than half, provided n, the number of people in
the room, is more than 23.  This property is not really a paradox, but many people
find it surprising.  Design a Java program that can test this paradox by a series
of experiments on randomly generated birthdays, which test this paradox for
n = 5, 10, 15, 20, ..., 100.

R-3.2 :  Describe a way to use recursion to add all the elements in a n x n 
(two dimensional) array of integers.