They are asking for the outcome of A and B, which means you need to include the results of both together.
The result would be {4,5,6,7,10,11,12}
Since there are no common numbers in either A or B, they would be mutually exclusive.
The answer would be the last one.
A.) 10^2
B.) 10^6
C.) 10^9
D.) 10^15
6n - 13 = 27
6n = 27 + 13
6n = 40
n = 40/6
n = 6 2/3
Answer: n = 6 2/3
See picture for answer and solution steps.