How many squares are there on chess board?
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No of ways to select horizontal lines is 2 from 9 = C(9, 2)
No of ways to select vertical lines is 2 from 9 = C(9, 2)
∵ Both are taken correspondingly
∴ Total no of rectangles = [C(9, 2)]² = [9! / 7! 2!]² = (36)² = 1296
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Answer:
there are 64 square in chess board.
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