Question

A set of 5 parallel lines intersect with another set of 3 parallel lines,then find the number of parallelograms formed​

Answer 1

Answer:

28

Step-by-step explanation:

Since there are 5 horizontal lines, therefore 4 rows are there. Also, for 3 vertical parallel lines, 2 columns will be formed.

Hence, the parallelograms will be around 28.

Answer 2

Answer:

30

Step-by-step explanation: since parallelograms are those whose opposite sides are parallel to each other,

(number of ways of selecting 2 out of 3 parallel lines * number of ways of selecting 2 out of 5 parallel lines )

=3^c2 * 5^c2 = 3 * 10 = 30 //