The sum sum is equal to |Sequences and Series JEEMain2019

JEE MAIN 2019

08-04-2019 S2

Question

The sum $\sum_{k=1}^{20} k \frac{1}{2^k}$ is equal to :

Select the correct option:

A

$2-\frac{3}{2^{17}}$

B

$1-\frac{11}{2^{20}}$

C

$2-\frac{21}{2^{20}}$

D

$2-\frac{11}{2^{19}}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

Question Tags

JEE Main

Mathematics

Easy

Start Preparing for JEE with Competishun