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NDA Math Binomial Theorem

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For the next three (3) items that follow :
Consider the expansion of (1+x)2n+1

[NDA II 2015]

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Question : 39

Total: 50

The average of the coefficients of the two middle terms in the expansion is

2n+1Cn+2
2n+1Cn
2n+1Cn−1
2nCn+1

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