If four digits are taken fromthe digits 1, 2, 3, 4, 5, 6, 7. The probability that the sum of digits is less than 12, is
The probability of happening exactly one of the two events A and B is
P(A) - P(B)
None of the above
The probability that at least one of the events A and B occurs is 0.7 and they occur simultaneously with probability 0.2. Then, is equal to
0.8
0.6
1.1
1.4
Seven weddings occur in a week. What is the probability that they happen on the same day?
None of these
C.
First wedding can be occured in a week in 7 ways. Similarly, second, third , ... , seventh wedding can also be occured in 7 ways.
Total number of cases of occuring the weddings = 77
Number of cases that these weddings occur on the same day = 7
Two small squares on a chess board are chosen at random. Probability that they have a common side is
If the integer are chosen at random between 1 and 100, then the probability that a number of the form is divisible by 5 is
1/4
1/7
1/8
1/49