You are given three non-zero numbers. Your task is to determine whether they form a geometric progression (GP), meaning the ratio between consecutive terms is constant.
Print Yes if the numbers form a geometric progression; otherwise, print No.
Input: a = 2, b = 4, c = 8
Output: Yes
Explanation: The common ratio is 2 throughout.
Input: a = 2, b = 6, c = 12
Output: No
Explanation: The ratios 3 and 2 are not equal.
Input: a = 3, b = 3, c = 3
Output: Yes
Explanation: A constant sequence has a common ratio of 1.
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