If $a - b = 1$ , then $a^{3} - b^{3} - 3 a b =$

-3

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-1

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Solution

The correct option is C 1
$a - b = 1$
$(a - b)^{3} = 1$
$a^{3} - b^{3} - 3 a b (a - b) = 1$
$a^{3} - b^{3} - 3 a b = 1$

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