Let $a_{1},a_{2},a_{3},\ldots$ be an A.P. If $\sum_{r = 1}^{\infty}\mspace{2mu}\frac{a_{r}}{2^{r}} = 4$, then $4a_{2}$ is equal to - Math Practice Question | divineJEE

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Let $a_{1},a_{2},a_{3},\ldots$ be an A.P. If $\sum_{r = 1}^{\infty}\mspace{2mu}\frac{a_{r}}{2^{r}} = 4$, then $4a_{2}$ is equal to

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