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13 Feb 2024, 09:04
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Difficulty:
25%
(medium)
Question Stats:
77% (02:00) correct
23%
(02:33)
wrong
based on 145
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For all positive integers \(r\), the sequence \(S_r\) is given by the formula
\(S_r = \frac{{1}}{{r+1}}-\frac{1}{r}\)What is the sum of the first 20 terms of the sequence?
(A) \(\frac{-22}{21}\)
(B) \(\frac{-20}{21}\)
(C) \(\frac{1}{21}\)
(D) \(\frac{20}{21}\)
(E) \(\frac{22}{21}\)
\(S_r = \frac{{1}}{{r+1}}-\frac{1}{r}\)
(A) \(\frac{-22}{21}\)
(B) \(\frac{-20}{21}\)
(C) \(\frac{1}{21}\)
(D) \(\frac{20}{21}\)
(E) \(\frac{22}{21}\)
13 Feb 2024, 09:04
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Check out question 6 in the video below for the solution:
14 Feb 2024, 09:40
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What is the approach to this one ?
