1.

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» C. ${3^{60}}$$


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