JEE Advanced Mathematics question
In the expansion of
- (A)the third term is , if Correct
- (B)the third term is , if
- (C)the value of the third term is , when
- (D)the value of the third term is , when Correct
Answer: (A),(D)
Solution
For :
(1+={}^{2}-{}^{3}+{}^{4}-{}^{5}+ (general term (- {}^{r+2} ).
For we must expand in powers of :
(1+=(1+1x=\{{}^{2}-{}^{3}1x+{}^{4}-\}.
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Question ID VK-108433