If 6 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?	Select:	A) 80	B) 63	C) 420	D) 160	E) 1260
parallelogram can formed by 2 horizontal and 2 vertical lines   for horizontal 6c2   for vertical 8c2   total parallelogram is 6 c2*8c2=15*28= 
<gadget id="calculator">15*28</gadget>
<output>420</output>
420   ANSWER:420
<result>C</result>
If 6 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?