Algebra-1

Question Analysis
This question tests the student's ability to identify the common ratio in a geometric sequence that alternates in sign. The sequence provided is .

Key Concept Explanation
In a geometric sequence, each term after the first is found by multiplying the previous term by a constant called the common ratio, denoted by . The common ratio can be calculated by dividing any term in the sequence by its preceding term.

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