Algebra-1

Question Analysis
This question evaluates the student's ability to use the explicit formula for the nth term of a geometric sequence when the common ratio is a fraction.

Key Concept Explanation
The explicit formula for the nth term of a geometric sequence is (). When the common ratio is a fraction, the terms decrease as the sequence progresses.

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