   Chapter 13.1, Problem 42E ### Algebra and Trigonometry (MindTap ...

4th Edition
James Stewart + 2 others
ISBN: 9781305071742

#### Solutions

Chapter
Section ### Algebra and Trigonometry (MindTap ...

4th Edition
James Stewart + 2 others
ISBN: 9781305071742
Textbook Problem

# SKILLS39-42 Partial Sums Find the first six partial sums S 1 , S 2 , S 3 , S 4 , S 5 and S 6 of the sequence whose nth terms is given.42. − 1 , 1 , − 1 , 1 , …

To determine

The first six partial sums of the sequence 1,1,1,1,

Explanation

Approach:

For the sequence,

a1,a2,...,an

The partial sums are,

S1=a1

S2=a1+a2

Sn=a1+a2+...+an

Calculation:

Consider the sequence,

1,1,1,1,

The numbers -1 and 1 are repeated in the sequence alternatively.

The first six partial sums of the sequence are,

S1=1

S2=1+1=0

S3=1+1+(1)=1

S4=1+1+(1)+1=0

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