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$The sum of the products of a (a - b), b (b - c), c (c - a) is$

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$a 2 + b 2 + c 2 − 2 a b − 2 b c − 2 c a$

$a 2 + b 2 + c 2$

$a 2 + b 2 + c 2 − a b − b c − c a$

answer is B.

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Detailed Solution

$a a − b + b b − c + c c − a$

$a 2 − a b + b 2 − b c + c 2 − c a$

$a 2 + b 2 + c 2 − a b − b c − c a$

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