If 5 parallel lines in a plane is intersected by a family of another 8 parallel lines, how many parallelograms are there in the network thus formed?
Choose the correct choice from the following answers
A) 280  B) 63  C) 120  D) 160  E) 1260
parallelogram can formed by 2 horizontal and 2 vertical lines   for horizontal 5c2   for vertical 8c2   total parallelogram is 5 c2*8c2=10*28= 
<gadget id="calculator">10*28</gadget>
<output>280</output>
280   280NSWER:280
<result>A</result>
If 5 parallel lines in a plane is intersected by a family of another 8 parallel lines, how many parallelograms are there in the network thus formed?