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Bunuel
How many parallelograms are formed when a set of five parallel lines intersect another set of four parallel lines ?

(A) 120
(B) 60
(C) 36
(D) 20
(E) 10

Given: How many parallelograms are formed when a set of five parallel lines intersect another set of four parallel lines ?

Number of parallelograms = 5C2 * 4C2 = 10 * 6 = 60

IMO B
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Hello from the GMAT Club BumpBot!

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