Consider the fourteen lines in a plane given by y = x + r, y = -x + r where r= 0,1,2,3,4,5,6 The number of squares formed by these lines whose diagonals are of length 2 is
A
9
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B
16
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C
25
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D
36
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Solution
The correct option is C 25 Required squares are =(7−2)2=25