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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