A set of m parallel lines another a...

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

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

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

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

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DIPTI PUBLICATION ( AP EAMET)-PERMUTATIONS & COMBINATIONS-EXERCISE 1B (COMBINATIONS )

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