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Question

Prove:
(a+b)3=a3+3a2b+3ab2+b3.

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Solution

(a+b)3=(a+b)2(a+b)

=(a2+2ab+b2)(a+b)

=a3+2a2b+ab2+a2b+2ab2+b3

=a3+3a2b+3ab2+b3

Hence Proved.

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