Algebra-1

Question Analysis
This question assesses the student's understanding of the explicit formula for the nth term of a geometric sequence, particularly when the common ratio is negative.

Key Concept Explanation
The explicit formula for the nth term of a geometric sequence is (). When the common ratio is negative, the sign of the terms alternates.

Step-by-step Solution
1. Identify the given values: , , and .
2. Substitute these values into the explicit formula:

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