A box contains certain number of balls of Black, White and Pink Colors in the ratio 6 : 9 : 20. If two balls are drawn randomly and probability of getting both the balls as Pink is 52/161, then find the number of Black Balls.

In a school, class1 had 12 football players, class2 had 15 football players, class 3 had 8 football players and class 4 had 5 football players. If one single football player is to be selected for interschool football match then what is the probability that the player is either from class 2 or class 3?

In a rummy game, 3 cards are drawn from a pack of 52 cards. What is the probability that all the three cards are of red colour?

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?