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In a plane there two families of lines :...

In a plane there two families of lines : y=x+r, y=-x+r, where `r in {0, 1, 2, 3, 4}.` The number of the squares of the diagonal of length 2 formed by these lines is____.

A

9

B

16

C

25

D

36

Text Solution

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The correct Answer is:
C
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