Question 1038634
What is the probability they will fail to get one ticket? That occurs only when they can't get one on the Web and by telephone.
That is 0.08*0.04=0.00032.  The probability of getting at least one is the complement, or 0.9968
The other way is probability of both working:0.8832
Getting one (0.96)(0.08)+(0.92)*0.04)=0.1136
That is 0.9968