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function sum(arr, n) { if( n<=0) { return n ; } else { return sum(arr, n-1) + arr[n-1] } sum([3,4,5], 3) sum([3,4,5], 2) + 5 sum([3,4,5], 1) + 4 + 5 sum([3,4,5], 0) + 4 + 5 1 + 4 + 5
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