Quantitative Aptitude Ques 228

Question: The average (arithmetic mean) of $ 3^{30}, $ $ 3^{60} $ and $ 3^{90} $ is

Options:

A) $ 3^{60} $

B) $ 3^{177} $

C) $ 3^{27}+3^{57}+3^{87} $

D) $ 3^{29}+3^{59}+3^{89} $

Show Answer

Answer:

Correct Answer: D

Solution:

  • Required arithmetic average (mean) $ =\frac{3^{30}+3^{60}+3^{90}}{3}=3^{29}+3^{59}+3^{89} $
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