A piece of electronic equipment has two essential parts A and B. In the past, part A

failed 30% of the times, part B failed 20% of the times and both failed simultaneously 5% of

the times. Assuming that both parts must operate to enable the equipment to function, the

probability that the equipment will function is

a) 0.1

b) 0.52

c) 0.55

d) 0.15