GMAT Math Prep Course by Wei Zhi

Author:Wei Zhi [Zhi, Wei]
Language: eng
Format: epub
ISBN: 9781889057507
Publisher: Nova Press
Published: 2009-09-15T05:00:00+00:00

The nth term of the sequence a1,a2,a3,…, an is defined as an = -(an-1). The first term a1 equals −1. What is the value of a5?

(A) -2

(B) -1

(C) 0

(D) 1

(E) 2

The sum of the first n terms of an arithmetic series whose nth term is n can be calculated by the formula n(n + 1)/2. Which one of the following equals the sum of the first eight terms in a series whose nth term is 2n?

(A) 24

(B) 48

(C) 56

(D) 72

(E) 96

The sum of the first n terms of aseries is 31, and the sum of the first n −1 terms of the series is 20. What is the value of nth term in the series?

(A) 9

(B) 11

(C) 20

(D) 31

(E) 51

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