The number of parallelograms that can be formed from a set of 4 parallel lines intersecting another set of 3 parallel lines is
A parallelogram is formed by choosing 2 lines from the first set and 2 lines from the second set.
Number = \(\binom{4}{2} \times \binom{3}{2} = 6 \times 3 = 18\)
Answer: (D) 18
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