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The sum Σ k 1/2^k k ∈[k = 1, 20] is equal to

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The sum Σ k 1/2k  k ∈[k = 1, 20]  is equal to

(1)   2- 21/220

(2)   1 - 11/220

(3)   2 - 3/217

(4)   2-11/219

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Correct option (4)   2-11/219

Explanation:

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