2n boys are randomly divided into two subgroups containing n boys each. The probability that the two tallest boys are in different groups is

2n boys are randomly divided into two subgroups containint n boys each. The probability that the two tallest boys are in different groups is a. n//(2n-1) b. (n-1)//(2n-1) c. (n-1)//4n^2 d. none of these

There are only two women among 20 persons taking part in a pleasure trip. The 20 persons are divided into two groups, each group consisting of 10 person. Then the probability that the two women will be in the same group is a. 9//19 b. 9//38 c. 9//35 d. none

Given that a family of two children has a boy , what is the probability that the other also is a boy?

Five boys and four girls sit in a row randomly. The probability that no two girls sit together

4 boys and 2 girls occupy seats in a row at random. Then the probability that the two girls occupy seats side by side is

Fourteen numbered balls (1, 2, 3, …, 14) are divided in 3 groups randomly. Find the probability that the sum of the numbers on the balls, in each group, is odd.

Three boys and two girls stand in a queue. The probability, that the number of boys ahead is at least one more than the number of girls ahead of her, is

5 boys and 5 girls are sitting in a row randomly. The probability that boys and girls sit alternately is-

10 different books and 2 different pens are given to 3 boys so that each gets equal number of things. The probability that the same boy does not receive both the pens is

In a throw of two unbiased dice, a boy gets a total of 5. Find the probability that he will not get a total of 5 in the next throw.