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

यदि f(n), (1 + x)(1 - x)n के प्रसार में xn का गुणांक है, तो f(2021) का मान क्या है?

1
-2019
2
2020
3
2021
4
-2022
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