This can be set at "Variables". Follow these steps:
- Go to "Questions" and "Variables" in the menu.
- Click on "Add Variable". Name the variable and click "Save".
- Under "Variable rules", click on "Add variable rule".
- At the top, select the name variable you just created.
- Choose the filling method for "Fill with random number from range".
- Now choose the lowest and highest value (eg 1 to 6, just like a dice).
- Finally, choose the "moment of completion". The random variables have been created.
- Create the variable as a condition for a question. Edit a question in the survey and click on condition.
- Choose "variables" and select the variables you have created.
- Set the condition, choose a value and click save.