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The following figure consists of 8 horizontal lines and 13 vertical lines. The g

Mathematics
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Jun 8th, 2015

In m*n matrix

So we first select any two rows and then select any two points in columns.
Number of ways to select any two rows = mP2
Number of ways to select any two points in a row = nP2
Thus total number of rectangles possible are = mP2*nP2


here m=12

n=7

so no. of rectangles = 12P2*7P2

=5544

Jun 8th, 2015

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