AP Computer Science A· difficulty 3/5
public static int mystery(int n) {
if (n == 0) return 0;
return n + mystery(n - 1);
}
System.out.println(mystery(5));What is printed?
15
10
5
120
Explanation
This sums 5+4+3+2+1+0 = 15. Pattern: triangle number n*(n+1)/2.
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