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Chapter 11: Q15. (page 586)

Find Sn for each arithmetic series described.

localid="1648546868155" a1=7,an=79,n=8

Short Answer

Expert verified

Snfor the arithmetic series isS8=344 .

Step by step solution

01

Step 1. Given Information.

Given arithmetic series is a1=7,an=79,n=8.

02

Step 2. Calculation.

The sum Sn of the first n terms of an arithmetic series is given by

Sn=n2(a1+an)

Here, a1=7,an=79,n=8

Plugging the values:

Sn=n2(a1+an)S8=82(7+79)S8=4(86)S8=344

03

Step 3. Conclusion.

Hence, the sum is S8=344.

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