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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 : 38

Total: 50

If the coefficients of xr and xr+1 are equal in the expansion, then r is equal to

n
2n−1
2
2n+1
2
n+1

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