alleryThe general term $T_{r+1}$ in the expansion of $(a+b)^n$ is:
A$\binom{n}{r} a^{n-r} b^{r-1}$
B$\binom{n}{r+1} a^{n-r} b^{r}$
C$\binom{n}{r} a^{r} b^{n-r}$
D$\binom{n}{r} a^{n-r} b^{r}$
Answer & Solution
Correct answer: D. $\binom{n}{r} a^{n-r} b^{r}$
The general term is T_{r+1} = C(n,r) a^{n−r} b^{r}.
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