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