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19-07-2016
Mathematics

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what is the sum of the first 5 terms of a geometric series with a a1 = 10 and r = 1/5 ?

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apologiabiology apologiabiology

19-07-2016

Sn=[tex] \frac{a1(1-r^n)}{1-r } [/tex]

a1=10
r=1/5
n=5

Sn=[tex] \frac{10(1-(1/5)^5)}{1-(1/5) } [/tex]
Sn=12.496

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