The average (arithmetic mean) of $3^{30}$,$3^{60}$ and $3^{90}$ is
The average (arithmetic mean) of $3^{30}$,$3^{60}$ and $3^{90}$ is
1). $3^{27}+3^{57}+3^{87}$
2). $3^{60}$
3). $3^{29}+3^{59}+3^{89}$
4). $3^{177}$
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# it from previous year ssc papers, $3^{60}$ is the right answer
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