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2015-06-11T13:42:02+08:00

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If you mean what is the formula for the general term, the general formula for the nth term of a geometric sequence is:
a_n=a_1*r^{n-1}
The common ratio in this geometric sequence is -2, the 1st term is 3 so:
a_n=3* (-2)^{n-1}
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