The common ratio of $1 + \dfrac{1}{2} + \dfrac{1}{4} + \dfrac{1}{8} + \cdots$ is —

Question

Accepted Answer

$\dfrac{1}{2}$

Answer

$2$

Answer

$\dfrac{1}{4}$

Answer

$-\dfrac{1}{2}$

The common ratio of 1+12+14+18+⋯1 + \dfrac{1}{2} + \dfrac{1}{4} + \dfrac{1}{8} + \cdots1+21​+41​+81​+⋯ is —