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Find an Explicit Rule for the Nth Term of the Sequence

Question 40

Multiple Choice

Find an explicit rule for the nth term of the sequence.
- −1,−5,−25,−125,…- 1 , - 5 , - 25 , - 125 , \ldots


A) an=5⋅−1na _ { n } = 5 \cdot - 1 ^ { n }
B) an=−1⋅5n−1a _ { n } = - 1 \cdot 5 ^ { n - 1 }
C) an=−1⋅5na _ { n } = - 1 \cdot 5 ^ { n }
D) an=5⋅−1n+1a _ { n } = 5 \cdot - 1 ^ { n + 1 }

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