For a GP, 1/2, 1/4, 1/8, … the sum of the first term S1 = 1/2, the sum of the first two term S2 is equal to 3/4 and the sum of the first three terms S3 is 7/8. Which of the following is the sum of the first five terms?   1. 15/16   2. 30/31   3. None of the answers   4.  31/32

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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  1. For a GP, 1/2, 1/4, 1/8, … the sum of the first term S1 = 1/2, the sum of the first two term S2 is equal to 3/4 and the sum of the first three terms S3 is 7/8. Which of the following is the sum of the first five terms?

      1.

    15/16

      2.

    30/31

      3.

    None of the answers

      4.

     31/32

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