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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

Answers (1)

The answer is the option (b).

 We need to select a pair of line from a set of 4 lines and another pair from another set of 3 lines to form a parallelogram

Required number = ^4C_2*^3C_2=6*3=18

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