1.

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

Answer»

`""^(m)C_(2)XX""^(N)C_(2)`
`""^(m)C_(3)xx""^(n)C_(2)`
`""^(m)C_(3)xx""^(n)C_(3)`
`""^(n)C_(2)xx""^(n)C_(2)-1`

ANSWER :A


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