What is the sum from n=1 to infinity of (2^n)/(4^n) ?

The sum from n=1 to infinity of (2^n)/(4^n) is 1

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sum from n=1 to infinity of (2^n)/(4^n)

n = 1 \sum \infty \frac{2 ^{n}}{4 ^{n}}

1

Solution steps

n = 1 \sum \infty \frac{2 ^{n}}{4 ^{n}}

Apply exponent rule:

\frac{a ^{n}}{b ^{n}} = (\frac{a}{b})^{n}

\frac{2 ^{n}}{4 ^{n}} = (\frac{2}{4})^{n}

= n = 1 \sum \infty (\frac{2}{4})^{n}

n = k \sum \infty (a_{n}) = n = 0 \sum \infty (a_{n}) - a_{0} - a_{1} - \dots a_{k - 1}

= n = 0 \sum \infty (\frac{2}{4})^{n} - (\frac{2}{4})^{0}

n = 0 \sum \infty (\frac{2}{4})^{n} = 2

= 2 - (\frac{2}{4})^{0}

Simplify

= 1

What is the sum from n=1 to infinity of (2^n)/(4^n) ?
The sum from n=1 to infinity of (2^n)/(4^n) is 1