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A set of m parallel lines intersect anot...

A set of m parallel lines intersect another set of n parallel lines in a plane. The number of parallellograms formed is

A

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

B

`""^(m)C_(3)xx""^(n)C_(2)`

C

`""^(m)C_(3)xx""^(n)C_(3)`

D

`""^(n)C_(2)xx""^(n)C_(2)-1`

Text Solution

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The correct Answer is:
A
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