If and then is equal to ____.
0.61
0.39
0.48
None of the above
If A and B are any two events, then ____.
The probability that at least one of the events A and B occurs is 3/5. If A and B occur simultaneously with probability 1/5, then is ____.
Let A and B be two events such that and where stands for complement of event A. Then events A and B are ____.
Independent but not equally likely
Mutually exclusive and independent
Equally likely and mutually exclusive
Equally likely but not independent
Let S be a set containing n elements and we select 2 subsets A and B of S at random then the probability that and is ____.
1/n
Two friends A and B have equal number of daughters. There are three cinema tickets which are to be distributed among the daughters of A and B. The probability that all the tickets go to daughters of A is 1/20. The number of daughters each of them have is ____.
4
5
6
3
5 boys and 5 girls are sitting in a row randomly. The probability that boys and girls sit alternatively is ____.
5/126
1/126
4/126
6/125
Comprehension
If n positive integers taken at random and multiplied together, then the chance that the last digit of the product would be. 1, 3, 5, 7, or 9 is
Both A and R are true and R is correct explanation of A
Both A and R are true and R is not correct explanation of A
A is true, R is false
A is false, R is true