defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Binomial Theorem Binomial Expansion

The coefficient of xk in the expansion of E = 1 + (1 + x) + (1 + x)2 + ... + (1 + x)n is 

1
nCk 
2
n+1Ck
3
n+1Ck+1
4
none of these
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