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Four parallel lines intersect another set of five parallel lines. Find the number of distinct parallelograms formed.

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The first set has 4 parallel lines and another set has 5 parallel lines.

To form a parallelogram, we need 2 lines from each set.

∴ Required number of distinct parallelograms formed = 4C2 × 5C2

= 6 × 10

= 60

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