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5 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

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Hehe AgC liu) er.2S3 vi)

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