Best way to get these done is to use Mathaway, you take a picture and it solves it however you need to,, it’s more efficient than going on here,, it’s also free,, lemme know how it works for you
You could simulate this by allowing the numbers 1-4 to represent a correct answer and the numbers 5-6 to represent an incorrect answer. This would have a 2/3 probability of the question in the simulation being correct.