A driver makes same trip everyday.he meets three trafic lights on trip.
A study established that :
. . the probability of meeting three red lights is 0.2
. . the probability of meeting at least one red light is 0.8
. . the probability of meeting one red light is 0.3.
We are given:
Find the probability:
(a) meets exactly two red lights
. . . . . . . . . . . . .
(b) does not meet a red light
The opposite of "no red lights" is "at least one red light".
(c) meets at most one red light.
"At most one red light" means: "no red lights" or "one red light".