A complete cycle of a traffic light takes 60 s. During each cycle the light is green for 25 s, yellow for 5 s and red for 30 s. At a randomly chosen time, the probability that the light will not be gr
A). 1/3
B). 1/4
C). 5/12
D). 7/12
The probability of occurrence of an event A is 5/9 . The probability of non-occurrence of the event B is 5/11. The probability that at least one of them will occur ?
A). 6/11
B). 5/9
C). 4/9
D). 0.8
A six - faced dice is so biased that is twice as likely to show an even number as an odd number when throw. It is thrown twice. The probability that the sum of two number thrown is even is ?
A). 1/12
B). 1/6
C). 1/3
D). 5/9
A bag contains 5 blue and 4 black balls. Three balls are drawn at random. What is the probability that 2 are blue and 1 is black ?
A). 1/3
B). 2/5
C). 1/6
D). None of these
Two number are selected randomly from the set S = {1, 2, 3, 4, 5, 6} without replacement one by one. The probability that minimum of the number is less than 4 is ?
A). 1/15
B). 14/15
C). 1/5
D). 4/5