**Answer:** 6/49.

There are 49 possible combinations when rolling two 7-sided dice.

There are still six ways of making a total of 7, therefore the probability is 6/49.

In each scenario, there are still only six ways of making a total of 7, the only thing that changes is the number of possible combinations.

7-sided > 6/49

8-sided > 6/64

9-sided > 6/81

10-sided > 6/100