A space vehicle has an independent backup system for one of its communication networks. The probability that

Question:

A space vehicle has an independent backup system for one of its communication networks. The probability that either system will function satisfactorily during a flight is 0.985. What is the probability that during a given flight
(a) Both systems function satisfactorily,
(b) Both systems fail,
(c) At least one system functions satisfactorily?