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Given an array containing three ints, return the sum of all the elements. It is safe to assume that the array always has at least 3...
X40: Sum 3 integers in array
Given an array containing three ints, return the sum of all the elements. It is safe to assume that the array always has at least 3 elements.
Examples:
sum3({1, 2, 3}) -> 6
sum3({5, 11, 2}) -> 18
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