Write a method that takes a List of Integers and returns the largest number in the list.

Examples:

Input: numbers = [5, 2, 9, 1, 7]
Output: 9
Explanation: 9 is the largest number in the list

Input: numbers = [-10, -5, -2, -8]
Output: -2
Explanation: -2 is the largest number among all negative numbers

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