The average (arithmetic mean) of 330 360 and 390 is

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The average (arithmetic mean) of 330, 360 and 390 is :

1. A. $${3^{27}} + {3^{57}} + {3^{87}}$$
2. B. $${3^{29}} + {3^{59}} + {3^{89}}$$
3. C. $${3^{60}}$$
4. D. $${3^{177}}$$

Answer: Option B

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