JEE PYQ: Sequence And Series Question 43
Question 43 - 2020 (09 Jan Shift 1)
The product $2^{1/4} \cdot 4^{1/16} \cdot 8^{1/48} \cdot 16^{1/128} \ldots$ to $\infty$ is equal to:
(1) $2^{1/2}$
(2) $2^{1/4}$
(3) 1
(4) $2$
Show Answer
Answer: (1)
Solution
$= 2^{1/4} \cdot 2^{2/16} \cdot 2^{3/48} \cdot \ldots = 2^{1/4 + 1/8 + 1/16 + \ldots} = 2^{1/2} = \sqrt{2}$