Create a method that finds the missing element in a list of consecutive integers.
The list contains integers from 1 to n with one number missing.
Examples:
Input: numbers = [1, 2, 4, 5]
Output: 3
Explanation: The missing number in the sequence 1-5 is 3
Input: numbers = [1, 3]
Output: 2
Explanation: The missing number in the sequence 1-3 is 2
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