試題詳解

304. Companies P, Q, and R use routes that take their trucks through a common inspection checkpoint each day. The number of trucks for each company that pass the checkpoint each day is as follows:

  Calculate the probability that at least one of two randomly chosen trucks is from Company P.
(A) 0.28
(B) 0.31
(C) 0.56
(D) 0.69
(E) 0.72