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In problems of Binomial Theorem like
Prove C (subscript 0)C(1)+C(1)C(r+1)+C(2)C(r+2)+...+C(n-r)C(n)
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Those terms will also be there(when we multiply 1 and 2) but their co-efficients will not be xn-r and they are not the terms of the series which we require.terms which we require are the co-effeients of xn-r in the expansion. |
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