The probability of inviting three friends on 5 consecutive days, exactly one friend a day and no friend is invited on more than two days is
A and B are two independent events. The probability of their simultaneous occurrence is $$\frac{1}{8}$$ and the probability that neither of them occurs is $$\frac{3}{8}$$. Then their individual probabilities are
A determinant of the second order is made with elements 0 and 1 . What is the probability that the determinant made is non-negative?
A and B each have a calculator which can generate a single digit random number from the set $$\{1,2,3,4,5,6,7,8\}$$. They can generate a random number on their calculator. Given that the sum of the two numbers is 12 , then the probability that the two numbers are equal is