Prove that (a+b+c)^3 -a^3 -b^3 -c^3 =3(a+b) (b+c) (c+a) – InterviewSolution

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1.	Prove that (a+b+c)^3 -a^3 -b^3 -c^3 =3(a+b) (b+c) (c+a)
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