# The average (arithmetic mean) of $3^{30}, 3^{60} \text { and } 3^{90}$ is.

**A.** $3^{27}+3^{57}+3^{87}$

**B.** $3^{29}+3^{59}+3^{89}$

**C.** $3^{60}$

**D.** $3^{177}$

## Show Answer

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Answer-B

Solution-

Solution(By Apex Team)

$\begin{array}{l}\text{ According to the question, }\\
\Rightarrow\Large\frac{3^{30}+3^{60}+3^{90}}{3}\\
\Rightarrow3^{29}+3^{59}+3^{89}\end{array}$