Posted by reema on Friday, May 4, 2012 at 9:58pm.
find the 15th term of the sequence
9,27,81............

math  bobpursley, Friday, May 4, 2012 at 10:07pm
sequence is ar^n where a=9, r=(3)^n
15 term> is 9 the zeroth term, or first. Let it be first, then r=(3)^(n1)
so 15th term...(9)(3)^14=43 046 721
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