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m parallel lines in a plane are intersec...

m parallel lines in a plane are intersected by a family of n parallel lines. The total number of parallelograms so formed is :

A

`((m-1)(n-1))/4`

B

`(mn)/4`

C

`(m(m-1)n(n-1))/2`

D

`(mn(m-1)(n-1))/4`

Text Solution

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The correct Answer is:
D
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