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How many parallelograms are formed by a set of 4 parallel lines intersecting on other set of 7 parallel lines?
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- There are 4C2 = 6 ways to choose two parallel lines from the set of 4 parallel lines. There are 7C2 = 21 ways to choose two parallel lines from a set of 7 parallel lines. Any parallelogram is made by one pair of line from the four, and one pair of line from the seven. Thus, the number of possible parallelograms is
(4C2)*(7C2) = (6)*(21) = 126 - 11 years agoHelpfull: Yes(83) No(2)
- (7-1)*(4-1) = 18
- 11 years agoHelpfull: Yes(4) No(16)
- (7-1)*(4-1)=18
- 11 years agoHelpfull: Yes(4) No(15)
- 7c2*4c2=126
- 11 years agoHelpfull: Yes(3) No(0)
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