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yan [13]
3 years ago
14

What is the sum of the first eight terms of a geometric series whose first term is 3 and whose common ratio is

tex.z-dn.net/?f=1%2F2" id="TexFormula1" title="1/2" alt="1/2" align="absmiddle" class="latex-formula">?
Mathematics
1 answer:
kifflom [539]3 years ago
7 0

Use the geometric series formula:

S_n = [a_1(1 - r^(n)]/(1 - r)

Let a_1 = 3

Let n = 8

Let r = 1/2

S_8 = [3(1 - (1/2)^8]/[(1 - (1/2)]

Simplify the right side using your calculator to find S_8, which is the sum of the first 8 terms.

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Discussion:

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