Given the sequence $$10, -5, 2.5, -1.25, \ldots$$ , the comm...

Question Analysis
This question tests the student's ability to identify and calculate the common ratio in a geometric sequence, including negative and fractional values. The sequence provided is .

Key Concept Explanation
A geometric sequence is defined by a constant ratio between consecutive terms. The common ratio is found by dividing any term by its preceding term.

Step-by-step Solution
1. Calculate the ratio between the second and first terms:

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