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how many parallelograms can be created with two rows of seven dots in each row. ?...

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how many parallelograms can be created with two rows of seven dots in each row. ? answer is 91 please explain how to get this, and also if we pick 7C2 i want to know the possible picture of the parallelogram, thanks. and also if you pick 1,2 as vertices for top , do you pick 1,2 as bottom too? thats make square and not parallelogram isnt it?

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Answer #1

Hehe AgC liu) er.2S3 vi)Now, if we pick 1,2 as vertices for top as well as bottom it would result in a square or a rectangle based on the distance between the rows. As we know that squares and rectangle are also parallelogram. Thus, the selection of same sets of dots from each of the rows is possible.

18-C0 .2.3N, ,5 (-1)

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