Find the first and third partial sums, s1 and s3, for the sequence
-$$a _ { n } = ( - 2 ) ^ { n }$$
A)-2, -6
B)-2, 2
C)-2, -8
D)-2, -14

Name: Find the first and third partial sums, s1 and s3, for the sequence -\[a _ { n } = ( - 2 ) ^ { n }\] A)-2, -6 B)-2, 2 C)-2, -8 D)-2, -14
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Question

Quizplus · Accepted Answer

The first partial sum $s_1$ is simply the first term of the sequence, which is $(-2)^1 = -2$. The third partial sum $s_3$ is the sum of the first three terms: $(-2)^1 + (-2)^2 + (-2)^3 = -2 + 4 - 8 = -6$.

Find the First and Third Partial Sums, S1 and S3 an=(−2)na _ { n } = ( - 2 ) ^ { n }an​=(−2)n

Find the First and Third Partial Sums, S1 and S3 $a _ { n } = ( - 2 ) ^ { n }$