What is the sum from n=0 to infinity of 2/(5^n) ?

The sum from n=0 to infinity of 2/(5^n) is 5/2

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sum from n=0 to infinity of 2/(5^n)

n = 0 \sum \infty \frac{2}{5 ^{n}}

\frac{5}{2}

Decimal

2.5

Solution steps

n = 0 \sum \infty \frac{2}{5 ^{n}}

Apply the constant multiplication rule:

\sum c \cdot a_{n} = c \cdot \sum a_{n}

= 2 \cdot n = 0 \sum \infty \frac{1}{5 ^{n}}

Apply Series Geometric Test:

\frac{5}{4}

= 2 \cdot \frac{5}{4}

Simplify

2 \cdot \frac{5}{4} : \frac{5}{2}

= \frac{5}{2}

What is the sum from n=0 to infinity of 2/(5^n) ?
The sum from n=0 to infinity of 2/(5^n) is 5/2