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The sum of the first n terms of a series is 31, and the sum
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02 May 2019, 02:33
02 May 2019, 02:33
Expert Reply
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Question Stats:
65% (00:36) correct
34% (00:31) wrong based on 23 sessions
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The sum of the first \(n\) terms of a series is 31, and the sum of the first \(n – 1\) terms of the series is 20. What is the value of \(n\)th term in the series?
(A) 9
(B) 11
(C) 20
(D) 31
(E) 51
(A) 9
(B) 11
(C) 20
(D) 31
(E) 51
Re: The sum of the first n terms of a series is 31, and the sum
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16 Apr 2020, 13:13
16 Apr 2020, 13:13
Expert Reply
Sum of the (n – 1) terms in the series + value of the nth term = sum of the n terms in the series
Value of the nth term = sum of the n terms in the series – sum of the (n – 1) terms in the series
Value of the nth term = 31 – 20 = 11
b is the answer
Value of the nth term = sum of the n terms in the series – sum of the (n – 1) terms in the series
Value of the nth term = 31 – 20 = 11
b is the answer
gmatclubot
Re: The sum of the first n terms of a series is 31, and the sum [#permalink]
16 Apr 2020, 13:13
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