alleryThe coefficient of $x^3$ in the expansion of $(2+x)^5$ is:
A10
B20
C40
D80
Answer & Solution
Correct answer: C. 40
T_{r+1}=C(5,r)2^{5−r}x^{r}; for x³, r=3: C(5,3)·2² = 10·4 = 40.
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