Missing Number

Simple

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You are given a sequence of integers, which are elements of arithmetic progression - the difference between the consecutive elements is constant. But this sequence is unsorted and one element is missing...good luck!

example

Input: List of integers (int).

Output: An integer (int).

Examples:

assert missing_number([1, 4, 2, 5]) == 3
assert missing_number([2, 6, 8]) == 4

Preconditions:

length of sequence > 2;

missing element is always between two elements in sequence.

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