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|x| < 1

(1 - x)^{- 3}

x^{r}

এর সহগ কত?

2 (r + 1) (1 + 2)

(r + 1) (1 + 2)

\frac{1}{2} (r + 1)

D \frac{1}{2} (r + 1) (r + 2)

ANS : 4

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