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while loop mystery

Language/Type: Java method basics mystery while loops
Author: Whitaker Brand (on 2010/12/28)

Given the following method:

public static int mystery(int i, int j) {
    int k = 0;
    while (i > j) {
        i = i - j;
        k = k + (i - 1);
    return k;

Write the value returned by each of the following calls.

mystery(2, 9)
mystery(5, 1)
mystery(38, 5)
mystery(5, 9)
mystery(40, 10)

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