You are given a geometric progression (GP) in which exactly one term is missing and represented by a placeholder (_). Your task is to find and return the missing term.
A geometric progression is a sequence in which the ratio between consecutive terms remains constant. The given sequence is guaranteed to form a valid GP when the missing term is restored.
Input: seq = [2, 4, _, 16]
Output: 8
Explanation: The common ratio is 2. Therefore, the missing term is 8.
Input: seq = [3, _, 27, 81]
Output: 9
Explanation: The common ratio is 3. Therefore, the missing term is 9.
Input: seq = [_, 10, 100, 1000]
Output: 1
Explanation: The common ratio is 10. Therefore, the first term is 1.
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2 4 _ 16 32
8
1 _ 9 27
3
