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Find the sum.

0 votes

Find the sum.

asked Feb 16, 2015 in PRECALCULUS by anonymous
reshown Feb 16, 2015 by goushi

1 Answer

0 votes

Step 1:

The sum is .

Rewrite the sum as image.

The sum is in the form of geometric sum image.

Therefore, the sequence is geometric.

The first term of the sum is .

The second term of the sum .

Common ratio image.

image

Step 2:

Sum of the first terms of the geometric series is .

Where is the first term and is the common ratio.

Substitute the values of and in .

image

Solution:

The sum is .

answered Feb 17, 2015 by Sammi Mentor

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