The probability a student will pass Test 1 is 4/5.
The probability that he will pass Test 2 is 3/4.
The probability that he will pass both tests is 2/3.
A.) What is the probability that he passes at least one test?
B.) What is the probability that he fails both tests?
A.) (4/5) + (3/4) = (31/20) - (12/20) = 19/20
B.) (1/5) x (1/4) = 1/20
Please correct me if I'm wrong, thanks!