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If m parallel lines in a plane are in...

If `m` parallel lines in a plane are intersected by a family of `n` parallel lines, the number of parallelograms that can be formed is a. `1/4m n(m-1)(n-1)` b. `1/4m n(m-1)(n-1)` c. `1/4m^2n^2` d. none of these

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