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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 : 24

Total: 120

Under what condition the coefficients of x2 and x4 are equal ?

p:q=7:2
p2:q2=7:2
p:q=2:7.
p2:q2=2:7

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