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If a set of m paralled lines intersect a...

If a set of m paralled lines intersect another set of n parallel lines (not parallelto the
lines in the first set), then find the number of parallelograms fromed in this lattice structure.

A

mn

B

`C(m,2)xxC(n,2)`

C

`C(m,2)+C(n,2)`

D

`C(m+,4)`

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The correct Answer is:
B
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