PHP Compiler Testing
Find the Missing Number

Create a function that takes a list of numbers between 1 and 10 (excluding one number) and returns the missing number.

Examples

missing_num([1, 2, 3, 4, 6, 7, 8, 9, 10]) ➞ 5

 

missing_num([7, 2, 3, 6, 5, 9, 1, 4, 8]) ➞ 10

 

missing_num([10, 5, 1, 2, 4, 6, 8, 3, 9]) ➞ 7