1.

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.

Answer»

MN
`C(m,2)XXC(n,2)`
`C(m,2)+C(n,2)`
`C(m+,4)`

ANSWER :B


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