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garri49 [273]
2 years ago
5

What is the sum of the first five terms of a geometric series with a = 10 andr = 1/5?

Mathematics
1 answer:
Zinaida [17]2 years ago
3 0

Answer:

12.496

Step-by-step explanation:

Here, to calculate the sum of the first five terms of the series, we use the formula for the sum of terms in a geometric series.

Mathematically, that would be;

Sn = a(1-r^n)/1-r

where Sn = ?

a = 10

r = 1/5 = 0.2

n = 5

Substituting these values into the equation above, we have;

Sn = 10(1-(0.2)^5)/1-0.2

Sn = 10(0.99968)/0.8

Sn = 12.496

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==============================

Here's a picky pickypoint to think about concerning the "cost".  I'm not quite sure what to do about this:

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