The probability that in the toss of two dice, we obtain the sum 7 or 11, is
1/6
1/18
2/9
23/108
An integer is chosen at random from first two hundred numbers. Then, the probability that the integer chosen is divisible by 6 or 8 is
1/4
2/4
3/4
None of these
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
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 at least one of the events A and B occurs is 0.6. If A and B occur simultaneously with probability 0.2, then is
0. 4
0.8
1.2
1.4
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
1/3
4/12
7/12
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
0.5
0. 44
0. 8
0. 25
P(A) = 4/5, P(B') = 2/5 and P(A∩B) = 1/2, then P(A∩B') is
3/10
5/2
2/5
5/7
If A and B are two independent events such that P(A∩B') = 3/25 and P(A' ∩B) = 8/25, then P(A) is
1/5
3/8
4/5
