The sum _ k=1 ^ 20 k 1 2^ k is equal to

Mathematics · JEE Main · NTA Exams — Progression and Series

1. \(2-\frac{21}{2^{20}}\)
2. \(1-\frac{11}{2^{20}}\)
3. \(z-\frac{3}{z^{17}}\)
4. \(z-\frac{11}{z^{19}}\)

Answer

(A) 2- 21 2^ 20

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