What is the sum from n=1 to infinity of 1/(2n!) ?

The sum from n=1 to infinity of 1/(2n!) is converges

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sum from n=1 to infinity of 1/(2n!)

n = 1 \sum \infty \frac{1}{2 n !}

converges

Solution steps

n = 1 \sum \infty \frac{1}{2 n !}

Apply the constant multiplication rule:

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

= \frac{1}{2} \cdot n = 1 \sum \infty \frac{1}{n !}

Apply Series Ratio Test:

converges

= \frac{1}{2} converges

= converges

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What is the sum from n=1 to infinity of 1/(2n!) ?
The sum from n=1 to infinity of 1/(2n!) is converges