A) \[r\]
B) \[r+1\]
C) \[r+3\]
D) \[r-1\]
Correct Answer: B
Solution :
Since, \[{{(1-x)}^{-2}}=1+2x+3{{x}^{2}}+....+(r+1){{x}^{r}}\] \[\therefore \] Coefficient of \[{{x}^{r}}\] in \[{{(1-x)}^{-2}}\] is \[(r+1)\].You need to login to perform this action.
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