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simona1@sfusd.edu arraylist1 > sum3List
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Given an ArrayList of Integers with size 3, return the sum of all the elements.


sum3List([1, 2, 3]) → 6
sum3List([5, 11, 2]) → 18
sum3List([7, 0, 0]) → 7

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public int sum3List(ArrayList <Integer> nums) { }

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