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Chapter 12: Q 70 (page 1175)

In the following exercises, write each sum using summation notation.

1鈭�3+5鈭�7+9+鈥�+21

Short Answer

Expert verified

The sum can be written as危n=111-1n+12n-1

Step by step solution

01

Step 1. Given information

1鈭�3+5鈭�7+9+鈥�+21

02

Step 2. Write the sum

We look for a pattern in the terms

1鈭�3+5鈭�7+9+鈥�+21

The signs of the terms alternate and the even terms are negative.

The sum written in summation notation is

localid="1646925610407" 危n=111-1n+12n-1

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