Answer:
6
Explanation:
You can use common knowledge and know that in order to get 4, you can't roll a 4 or higher on one of the dice take out a total of 4 numbers from both dices combined
For 6, you can't get any number higher than 6 or the number 6 on both of the dice. This takes out only 2 numbers.
Now if you take both of the number that we found (the numbers that are in bold) the amount of numbers that you can't roll for 6 is less, meaning there is a higher probability of rolling 2 numbers that have a total of 6.