You are given a list of integers nums that used to be an arithmetic sequence. Given that a number was removed, and that the number was not the first or the last element, return the removed number.
Constraints
2 ≤ n ≤ 100,000https://binarysearch.com/problems/Complete-an-Arithmetic-Sequence
Input
[1, 3, 5, 9]Output
7Explanation
If we add 7 in to this sequence, we get [1, 3, 5, 7, 9] which is an arithmetic sequence.
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