A geometric sequence has the first term 20 and a common rati...

Question Analysis
This question tests the student's ability to write the explicit formula for a geometric sequence and use it to find a specific term, particularly when the common ratio is negative.

Key Concept Explanation
The explicit formula for the -th term of a geometric sequence is (), where is the first term and is the common ratio.

Step-by-step Solution
1. Identify the first term and the common ratio .
2. Write the explicit formula:

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Algebra-1

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