Let A and B are two events and P(A') = 0.3, P(B) = 0.4, P(A∩B') = 0.5, then P(A∪B') is
0.5
0.8
1
0.1
If A and B are mutually exclusive events with P(A) = 1/2 x P(B) and AυB = S, then P(A) is equal to
2/3
1/3
1/4
3/4
If the probability of A to fail in an examination is 0.2 and that for B is 0.3, then probability that either A or B is fail, is
0. 44
0. 8
0. 25
A person draws a card from a pack of playing cards, replaces it and shuffles the pack. He continues doing this until he draws a spade. The chance that he will fail the first two times is
9/64
1/64
1/16
9/16
If 4 P(A) = 6 P(B) = 10 ; P (A∩B) = 1, then (B/A) is
3/5
7/10
19/60
2/5
P(A) = 4/5, P(B') = 2/5 and P(A∩B) = 1/2, then P(A∩B') is
3/10
5/2
5/7
A number is chosen at random among the first 120 natural numbers. The probability if the number chosen being a multiple of 5 or 15 is
1/8
1/5
1/24
1/6
A complete cycle of a traffic light take 60 s. During each cycle the light is green for 255, yellow for 5 s and red for 30s. At a randomly chosen time, the probability that the light will not be green, is
4/12
7/12
If the random variable X takes the values x1,x2,x3,....x10 with probabilities P(X = xi) = Ki then the value of K is equal to.
1/10
1/55
The probability that in the toss of two dice, we obtain the sum 7 or 11, is
1/18
2/9
23/108
