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