173. Check if Array is Arithmetic Progression

Write a function solve that checks if an array can be rearranged to form an arithmetic progression. An arithmetic progression is a sequence where the difference between consecutive terms is constant.

Example:
Input: [3, 5, 1]
Output: true (can be arranged as [1, 3, 5] with difference 2)

Example 2:
Input: [1, 2, 4]
Output: false

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