UPSC NDA I 2021 Mathematics Solved Paper

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Question : 49 of 120
 
Marks: +1, -0
If C0,C1,C2,−−−−−,Cn are the coefficients in the expansion of (1+x)n, then what is the value of C1+C2+C3+−−−−−+Cn ?
[NDA-I 2021]
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