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Question
Find the indicated term in the following sequence whose nth term is:
`a_n = (–1)^(n – 1) n^3; a_9`
Sum
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Solution
an = (−1)n−1 n3
Substituting n = 9, we obtain
a9 = (−1)9−1 (9)3
= (9)3
= 729
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