TS EAMCET · Maths · Binomial Theorem
If is the coefficient of in the expansion of then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
1+x1-xn=1-xn+x1-xn Coefficient of xn in 1+x1-xn=fn ⇒fn= Coefficient of xn in 1-xn+ Coefficient of xn-1 in 1-xn ⇒f2021=-12021 C20212021+-12020 C20202021 ⇒f2021=-1+2021 f2021=2020
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