Teaching HSSC TGT 2023 Mock Test (Latest Pattern) Mathematics Binomial Theorem Binomial Expansion

The coefficient of xn in the expansion of (1 + x)(1 - x)n is:

1
(n - 1)
2
(-1)n-1n
3
(-1)n(1 - n)
4
(-1)n-1(n - 1)2
5
Not Attempted
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