Among 110 students in a probability class. On a three-question
exam, 29 get question 1 incorrect, 39 get question 2 incorrect, and
22 get question 3 incorrect. Further, 19 students get both
questions 1 and 2 incorrect, 13 get both questions 2 and 3
incorrect, and 7 get both questions 1 and 3 incorrect. In addition,
6 get all three questions incorrect.

Find the probability that a randomly selected student:

a) Gets question 1 incorrect but gets question 2 correct.

b) Gets questions 2 and 3 incorrect but gets question 1
correct.

c) Gets all three questions correct.