Q.

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

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a

mC2× nC2

b

mC3× nC2

c

mc3×nc3

d

mC2× nC2−1

answer is A.

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Detailed Solution

The number of parallelograms formed is =mc2×nc2
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A set of m parallel lines intersect another set of n parallel lines in a plane. The number of parallelograms formed is