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UPSC NDA 2 2022 Mathematics Solved Paper

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Consider the following for the next three (03) items that follow:
Consider the binomial expansion of (p+qx)9 :

[NDA II 2022]

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Question : 23

Total: 120

What is the ratio of the coefficients of middle terms in the expansion (when expanded in ascending powers of x )?

pq
p∕q
4p∕5q
1∕(pq),

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