If coefficients of a^m and a^n in the expansion of (1+a)^{m+n} are \alpha and \beta, then which one of the following is correct? [NDA I 2018]

NDA Math Binomial Theorem

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If coefficients of am and an in the expansion of (1+a)m+n are α and β, then which one of the following is correct?

[NDA I 2018]

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