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
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 P(A) = P(B) = P(C) = 1/4, P (AB) = P (CB) = 0 and P(AC) = 1/8, then P(A+B) is equal to
5/8
37/64
1/2
A coin and six faced die, both unbiased, are thrown simultaneously. The probability of getting a head on the coin and an odd number on the die, is
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
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
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 P (A∩B) = 1/3, P(A∪B) = 5/6 and P(A) = 1/2, then which of the following is correct?
A and B are independent events
A and B are mutually exclusive events
P(A) = P(B)
P(A) < P(B)
A dice is thrown 100 times, getting an even number is considered a success. The variance of the number of success is
10
25
18
The probability that in the toss of two dice, we obtain the sum 7 or 11, is
1/18
2/9
23/108