The sum Σ k = 1 ²⁰ k1/(2^(k)) is equal to

Sequence and Series: JEE Main 2019 Mathematics question

JEE Main 2019 · 8 Apr, Evening shift · Q5305

JEE Main 20198 Apr, Evening shiftMathematicsMediumSequence and Series179× since 2002

The sum

\sum\limits_{k = 1}^{20} {k{1 \over {{2^k}}}}

is equal to

JEE Main 2019 · 8 Apr, Evening shift · Q5305

JEE Main 20198 Apr, Evening shiftMathematicsMediumSequence and Series179× since 2002

The sum

\sum\limits_{k = 1}^{20} {k{1 \over {{2^k}}}}

is equal to