In n parallel lines in a plane are inter...

In n parallel lines in a plane are intersected by a family of m parallel lines, then the number of parallelograms formed in the network will be -

A

`""^(m+n)C_(2)`

B

`""^(m+n) C_(4)`

C

`""^(m) C_(2) xx""^(n)C_(2)`

D

`""^(mn) C_(2)`

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The correct Answer is:

C

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