64) How many rectangles are there on a chessboard?
a) 36
b) 1096
c) 1296
d) 4096

• There are 9 vertical lines and 9 horizontal lines. To form a rectangle
  you must choose 2 of the 9 vertical lines, and 2 of the 9 horizontal
  lines. Each of these can be done in 9C2 ways = 36 ways. So the number
  of rectangles is given by 36^2 = 1296
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