The number of parallelograms that can be formed from a set of four parallel lines intersecting
The number of parallelograms that can be formed from a set of four parallel lines intersecting another set of three parallel lines is
(A) 6
(B) 18
(C) 12
(D) 9
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Answer is (B)
To form parallelogram we required a pair of line from a set of 4 lines and another pair of line from another set of 3 lines.
Required number of parallelograms = 4C2 x 3C2 = 6×3 = 18
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