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
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
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
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
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
3/8
4/5
The probability that atleast one of A and B occurs is 0.6. If A and B occur simultaneously units probability 0.3, then P(A') + P(B') is
0.9
0.15
1.1
1.2
If 4 P(A) = 6 P(B) = 10 P (A∩B) = 1, then (B/A) is
3/5
7/10
19/60
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
The probability that in the toss of two dice, we obtain the sum 7 or 11, is
1/18
2/9
23/108
