Solution
$$a^{3}-b^{3}=(a-b)^{3}+3ab(a-b)=(1)^{3}+3(6)(1)=19$$
So the answer is option C.
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$$a^{3}-b^{3}=(a-b)^{3}+3ab(a-b)=(1)^{3}+3(6)(1)=19$$
So the answer is option C.
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