Five boys and some number of girls are sitting in a row. The probability that all girls are sitting together is 1/42. What is the total number of girls in the group?

Five boys and some number of girls are sitting in a row. The probability that all girls are sitting together is 1/42. What is the total number of girls in the group?

From group of 3 boys and x girls, one student is selected at random for Interschool quiz competition. The probability that the selected student is girl is 4/7. If three students are selected at random then what is the probability that two are girls and one is boy?

In a forest, there are some venomous snakes and some non-venomous snakes. An ayurvedic company executive goes to the forest to catch some venomous snakes then the probability that one venomous snake is caught is 2/17. If in the forest there are total 153 snakes, then how many non – venomous snakes are there in the forest?

Two friends Ram and Sham appear in an interview . There is 25% probability that Ram can be selected and 20% probability that Sham can be selected , then what is the probability that none of them get selected?

If four coins are tossed together, what is the probability of at least getting 2 heads?

Find the probability that a two-digit number, chosen at random, is a multiple of 4 given that it is also a multiple of 6.

There are 200 balls (numbered 1 to 200) in a box. Find the probability of choosing a ball which bears either perfect cube or perfect square and the unit digit is either multiple of 3 or multiple of 2?

A bag contains ‘x’ red, ‘2x – 1’ blue and ‘3x – 2’ green balls. Two balls are randomly drawn from the bag and the probability that a blue ball and a green ball are drawn is 1/3. Find the total number of balls in the bag.

A bag contains certain number of green and pink balls. The ratio of the number of green and pink balls in the bag is 2: 3 respectively. Two balls are randomly drawn from the bag and the probability that both the balls are pink is 6/17. Find the total number of balls in the bag.

In a class of 25 students comprising 15 boys, what is the probability that exactly one of the three class representatives is a girl?