A small, experimental plane has three engines, one of which is redundant. That is, as long as two of the engines are working, the plane will stay in the air. Over the course of a typical flight, there is a 1/3 chance that engine one will fail. There is a 65% probability that engine two will work. The third engine works only half the time. What is the probability that the plane will crash in any given flight?
Select.
A) 7/12	B) 1/4	C) 1/2	D) 7/24	E) 17/24
In probability questions the trap answer is just the multiple of the numbers in the question.   i.e. if you multiply 1/3 * 1/4 * 1/2 = 1/24 is trap answer   The other trap answer could be 2/3 * 3/4 * 1/2 = 6/24 is trap answer   So lets say you have30 secsand you want to guess the answer then B, C are ruled out because they can be traps. You best guess is A, D, E. So you have 33% chances of being correct.   17/24
<result>E</result>
A small, experimental plane has three engines, one of which is redundant. That is, as long as two of the engines are working, the plane will stay in the air. Over the course of a typical flight, there is a 1/3 chance that engine one will fail. There is a 65% probability that engine two will work. The third engine works only half the time. What is the probability that the plane will crash in any given flight?