If 10 parallel lines in a plane are intersected by a family of another 8 parallel lines how many parallelograms are there in the network thus formed ?

If n parallel straight line in a plane are intersected by a family of m parallel lines, how many parallelograms are there in the network thus formed?

If n parallel straight lines in a plane are intersected by a family of m parallel lines , how many parallelograms are there in the network thus formed ?

If m parallel lines in a plane are intersected by a family of n parallel lines, find the number of parallelograms formed.

If m parallel lines in plane are intersected by a family of n parallel lines, find the number of parallelogram formed.

m parallel lines in a plane are intersected by a family of n parallel lines. The total number of parallelograms so formed is :

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) c. 1/4m^2n^2 d. none of these

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) c. 1/4m^2n^2 d. none of these

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