how to solve these questions please help

Awe Sum of the technical problems in a Technical war book and /tax personal can solve 83 % problems. Now a problem is chosen at random. What is he probability that either Army or Naval personal can solve the problem? The event Al What a certain part of an airplane works during a flight is determined to be 0.99 Sine the engineers are reluctant to risk the probability 0.01 of failure they insert another pare in parallel This means the failure occurs if and only if both parts fail. Let The event AZ stand for the success of the second part. Assume that it has been determined that P ( A2 ) = 0.99 and that Al and A2 are independent events. Find the probability of success. ( 0.9899) An auto engineer has found that a car will require a tune-up with probability 0.6, a brake-job with probability 0.1 and both with probability 0.02. What is the probability that a car requires either a tune-up or a break-job or both (0.68) "Life isn't about finding yourself. Life is about creating yourself."