In a binomial distribution B(n,p=41), if the probability of at least one success is greater than or equal to 109, then n is greater than
There are two red, two blue, two white, and certain number (greater than 0) of green socks in a drawer. If two socks are taken at random from the drawer without replacement, the probability that they are of the same color is 1/5, then the number of green socks are _______.
If A and B are two events such that P(A) = 21 and P(B) = 32, then show that
(c ) P(A∩B)≤31(d)61≤P(A∩B)≤21
A bag contains 50 tickets numbered 1, 2, 3, …, 50 of which five are drawn at random and arranged in ascending order of magnitude (x1<x2<x3<x4<x5). Find the probability that x3=30.
In a certain city, only 2 newspapers A and B are published. It is known that 25% of the city population read A and 20% read B while 8% reads both A and B. It is also known that 30% of those who read A but not B look into advertisement and 40% of those who read B but not A look into advertisements while 50% of those who read both A and B look into advertisements. What is the percentage of the population who read an advertisement?
Three integers are chosen at random from the set of first 20 natural numbers. The chance that their product is a multiple of 3 is