the sum of the first 15 terms for the geometric sequence 5,10 20, ... is
5115
In mathematics, a geometric progression (also called a geometric progression) is a sequence of nonzero numbers where each term after the first multiplies the previous term by a fixed nonzero number called the common ratio It is required by
A geometric sequence is a sequence in which each term is found by multiplying the previous term by the same value. Its general term is a n = a 1 r n - 1. The value of r is called the common ratio. It is found by dividing any term in the sequence by the previous term.
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