Given a list of integers forming an arithmetic progression (where the difference between consecutive elements is constant), your task is to find the missing element. However, the sequence provided is unsorted.
Complete the missing_number function. This function should take an unsorted list L as input and return the missing element in the sequence.
For example, if the input list is [4, 2, 6, 10, 12], the missing element is 8.
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Last Solution submitted on Nov 30, 2025

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