Question

What is the sum of infinite geometric series with first term equal to 1 and common ratio is ½?

• A. ∞
• B. 2
• C. 1
• D. 4

Answer 1

Answer:

B. 2

$$By the formula for sum of the infinite geometric series

$S=\frac{a}{1-r}$

$=\frac{1}{1-1/2}$

$=2$