все 3 числа равны. Я ведь написал условие для него
package com.javarush.task.task04.task0417;
/*
Существует ли пара?
*/
import java.io.*;
import java.util.*;
public class Solution {
public static void main(String[] args) throws Exception {
Scanner sc1 = new Scanner(System.in);
int a = sc1.nextInt();
Scanner sc2 = new Scanner(System.in);
int b = sc2.nextInt();
Scanner sc3 = new Scanner(System.in);
int c = sc3.nextInt();
if (a == b)
System.out.println(a + " " + b);
else if (a == c)
System.out.println(a+ " " + c);
else if (b == c)
System.out.println(b + " " + c);
else if (a == b && b == c && a == c)
System.out.println(a + " " + b + " " + c);
}
}