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If m parallel lines in a plane are int...

If `m` parallel lines in a plane are intersected by a family of `n` parallel lines, the number of parallelograms that can be formed is a. `1/4m n(m-1)(n-1)` b. `1/4m n(m-1)` c. `1/4m^2n^2` d. none of these

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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