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A bag contains 19 white and some black balls. If the probability of drawing a black ball from the bag is twice that of drawing a white ball, find the nu...
A number is chosen at random from first 20 natural numbers. Find the probability that the chosen number is prime.
A bag contains 20 white and some black balls. If the probability of drawing a black ball from the bag is 6.25 times that of drawing a white ball, find t...
What is the probability that a number selected from 1,2,3.......................68,69,70, is perfect square or a perfect cube?
19 rotten bananas are accidentally mixed with 136 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banan...
Axe speaks truth only when Wye does not speak truth, then what is the probability that Zed does not speak truth on a question?
In a purse, there are 3 two-rupee coins and 4 five-rupee coins. If you randomly select 4 coins from the purse, what is the probability that you will cho...
Two hats are picked at random, what is the probability that one is blue and one is yellow?
A box contains 13 black and 13 white balls. The probability of drawing two balls of the same colour is?