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Aditya ramon diaz Peter Hayes Cliff Pickover Another way to do it is to consider in how many ways you can pick an r by s rectangle from the figure. For some fixed corner, there are 5-r x-coordinates and 5-s y-coordinates available. So, we need to sum (5-r)(5-s) from over r and s from 1 to 4, which is [1/2 *4 *5]^2 = 100.

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