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 :

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

` (m n)/(4)`

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

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

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