A machine comprises of 3 transformers a b and c .the machine may operate if atleast two transformers

... are working .the probability of each transformer working are given as shown below. so p(a)=0.6, p(b)=0.5,p(c)=0.7 the mechanical engineer went to inspect the working condition of those transformers . find the probabilities of having the following outcomes. 1 only one transformer operating