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

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

Options:

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

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

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

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

Answer: Option B

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