Questions
The number of squares that we can find on a chess board is
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a
64
b
160
c
224
d
204
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Correct option is D
To get a square of size r x r, we must choose (r + 1) consecutive horizontal and (r + 1) consecutive vertical lines. This can be done in (9 – r) (9 – r) = (9 – r)2 ways.Similar Questions
There arepoints in a plane, no two of which are in a straight line except 4, all of which are in a straight line. The number of triangles that can be formed by using these points is
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