Thank for your help...
I tried this and i got what I want

but MT question is appearing in the survey , i tried to hide this then my Q4 is not appearing in the survey.
For your reference, I attached that file It would be great if you help me on this.
(Just a summary what i did)
1. I created Q1 & Q2 multichoice with same codes ....
2. Created MT field for Auto punch Q1/Q2 values.
3. Created Equation in question type - field name Dum ..
4. I included MT in the Array for Q4 .
If i preview the survey MT is appearing but i want to hide the same.
Do we have any option to hide