Want to show 4 radio button at questions string position

I am making a quiz app with string array. I want to random questions so that every time user start quiz he will see a different question from string array like if questions array has 8 question then question appear randomly like some time shows 6th question in first position so for that i m using random function and questions appears randomly as i want but options are setting in their sequence not according to question if question number 8 is coming at 1st position with random function then options position 8 will have to set at that position, but its not working so that i want your help to resolve this.

Here is my Code

    int flag[]={0,1,3,5,6,7,8};
Random random;
int   numbb;
public static int marks=0,correct=0,wrong=0;
LinearLayout linearLayout;
LayoutInflater mLayoutInflater;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_secon);
    final TextView score = (TextView)findViewById(R.id.textView4);
    TextView textView=(TextView)findViewById(R.id.DispName);
   random=new Random();
    final int[] numb = {flag[random.nextInt(flag.length)]};
    /*

    Intent intent = getIntent();
    String name= intent.getStringExtra("myname");

    if (name.trim().equals(""))
        textView.setText("Hello User");
    else
        textView.setText("Hello " + name);*/


    submitbutton=(Button)findViewById(R.id.button3);
    quitbutton=(Button)findViewById(R.id.buttonquit);
    tv=(TextView) findViewById(R.id.tvque);
    radio_g=(RadioGroup)findViewById(R.id.answersgrp);
    rb1=(RadioButton)findViewById(R.id.radioButton);
    rb2=(RadioButton)findViewById(R.id.radioButton2);
    rb3=(RadioButton)findViewById(R.id.radioButton3);
    rb4=(RadioButton)findViewById(R.id.radioButton4);
    tv.setText(questions[numb[0]]);
    rb1.setText(opt[0]);
    rb2.setText(opt[1]);
    rb3.setText(opt[2]);
    rb4.setText(opt[3]);
    submitbutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //int color = mBackgroundColor.getColor();
            //mLayout.setBackgroundColor(color);

            if(radio_g.getCheckedRadioButtonId()==-1)
            {
                Toast.makeText(getApplicationContext(), "Please select one choice", Toast.LENGTH_SHORT).show();
                return;
            }
            RadioButton uans = (RadioButton) findViewById(radio_g.getCheckedRadioButtonId());
            String ansText = uans.getText().toString();
//                Toast.makeText(getApplicationContext(), ansText, Toast.LENGTH_SHORT).show();
            if(ansText.equals(answers[numb[0]])) {
                correct++;
                Toast.makeText(getApplicationContext(), "Correct", Toast.LENGTH_SHORT).show();
            }
            else {
                wrong++;
                Toast.makeText(getApplicationContext(), "Wrong", Toast.LENGTH_SHORT).show();
            }

            numb[0]++;

            if (score != null)
                score.setText(""+correct);

            if(numb[0] <questions.length)
            {
                tv.setText(questions[numb[0]]);
                rb1.setText(opt[numb[0] *4]);
                rb2.setText(opt[numb[0] *4 +1]);
                rb3.setText(opt[numb[0] *4 +2]);
                rb4.setText(opt[numb[0] *4 +3]);
            }
            else
            {
                marks=correct;
                Intent in = new Intent(getApplicationContext(),highscore.class);
                startActivity(in);
            }
            radio_g.clearCheck();
        }
    });