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Chapter 12: Q 117. (page 1185)

In the following exercises, find each sum.

鈭�i=1408i鈭�7

Short Answer

Expert verified

The obtained sum is 6280.

Step by step solution

01

Step 1. Given Information.

Consider the given sum: 鈭�i=1408i鈭�7

02

simplify the sum.

Express the sum and identify the values.

鈭�i=1408i鈭�7=81鈭�7+82鈭�7+83鈭�7+鈰�+840鈭�7=1+9+17+鈰�+313=a1+a2+a3+鈰�+an

03

Step 3. Find the sum.

Substitute the values in some formula Sn=n2a1+an.

S40=4021+313=20314=6280

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Most popular questions from this chapter

Write the first five terms of the sequence whose general term isan=2n!.

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