How to prevent the same multiplication numbers being asked twice in a row

sorry to bother you once again but I have one more add on to be made to this program. It works fine but how could it be made so it wouldn't ask the same multiplication question twice in a row? For example when it asks what is 1*2 it shouldn't ask it again right away (although there's only a small chance on that).

import java.util.Random;
import javax.swing.JOptionPane;

public class Main{

  public static void main(String[] args) {

  boolean correctAnswer;
  Random number = new Random();
  int nmb1;
  int nmb2;
  int multi;


  while (true) {
    nmb1 = number.nextInt(10) + 1;
    nmb2 = number.nextInt(10) + 1;
    multi = nmb1 * nmb2;

    // read the user's input ...
    do {
        correctAnswer = multiplication(nmb1,nmb2,multi);
    }
    while (correctAnswer != true);
    // .. and repeat until the user types the correct answer

    JOptionPane.showMessageDialog(null, "Right");
  }
   }


  public static boolean multiplication(int number1,int number2,int answer)
  {

  int question;

     question = Integer.parseInt(JOptionPane.showInputDialog("How much is" + number1 + "*" + number2));

      if (question != answer) {
          JOptionPane.showMessageDialog(null, "Wrong, try again");

          return false;
      }

  return true;

  }

}