Find the sum of the products of the ten ...

Find the sum of the products of the ten numbers `+-1,+-2,+-3,+-4,a n d+-5` taking two at a time.

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Sum `=4+6=10` Product `=4 cdot xx 6=24` 2 is added to the product `=24+2=26` `therefore 10,24,26` are Pythagorean triples.

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