A ship is fitted with three engines `E_1,E_2 and E_3`. The engines function independently of each other with respective probabilities `1/2, 1/4, and 1/4`. For the ship to be operational at least two of its engines must function. Let `X` denote the event that the ship is operational and let `X_1, X_2 and X_3` denote, respectively, the events that the engines `E_1, E_2 and E_3` are function. Which of the following is/are true?

Options

A. `P[X_(1)^(c )//X]=3/(16)`
B. `P["exactly two engines of the ship are functioning"//X]=(7)/(8)`
C. `P[X //X_2]=(5)/(16)`
D. `P[X //X_1]=(7)/(16)`

Answer

B, D