A set of 4 parallel lines intersect with another set of 5 parallel lines
A set of 4 parallel lines intersect with another set of 5 parallel lines

Q. A set of 4 parallel lines intersect with another set of 5 parallel lines. How many parallelograms are formed?

           (A) 20               (B) 48                         (C) 60                         (D) 72

Ans: 60

Sol:

Number of parallelogram

= 4C2× 5C2

=6×10

=60
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