We have the event E defined as:
E: The sum of two rolled dice is greater than or equal to 3
The event E^c is the negation of the event E. Then:
E^c: The sum of two rolled dice is smaller than 3
For two dice, the minimum sum is 2, so this is equal to the event "the sum of two rolled dice is 2". There is only one outcome:
Dice 1: 1
Dice 2: 1
Sum: 2
Then, the only possible outcome for E^c is {1, 1}