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The number of parallelograms that can be...

The number of parallelograms that can be formed from a set of four parallel straight lines intersecting another set of three parallel straight lines is

A

6

B

18

C

12

D

9

Text Solution

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The correct Answer is:
B
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PATHFINDER-PERMUTATION AND COMBINATIONS-QUESTION BANK
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  5. In a room each person present shakes hand with the other . If the tota...

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  16. There are 13 stations on a certain railway line.How many kinds of diff...

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  17. Prove that (2n!)/(n!)={1.3.5.....(2n-1)}2^n

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