Prove that : (1+""^nC1+""^nC2+""^nC3+......

Prove that : `(1+""^nC_1+""^nC_2+""^nC_3+...+""^nC_n)^2=1+""^(2n)C_1+""^(2n)C_2+""^(2n)C_3+...+""^(2n)C_(2n)`

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A DAS GUPTA-Binomial Theorem for Positive Integrel Index-Exercise

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