Question

find summation of given attachment ​

Answer 1

Answer:

4

Step-by-step explanation:

Open summation

$s = 2 + 1 + \frac{1}{2} + \frac{1}{4} ......\infty \\ 2s = 4 + (2 + 1 + \frac{1}{2} ......\infty) \\ 2s = 4 + s \\ s = 4$