From the English alphabers one letter is chosen at random. What is the probability that it is a vowel?

Joseph kept 26 cards in a cap. Bearing one English alphabet on each card. One card is drawn at random. What is the probability that the card drawn is a vowel card?

A box contains 6 nails and 10 nuts. Half of the nails and half of the nuts are rusted. If one item is chosen at random, then find the probability that it is rusted or is a nail.

In a class 30% students failed in English, 20% students failed in Hindi, 10% students failed in English and Hindi both.A student is chosen at random. What is the probability that he will fail in English if he has failed in Hindi?

A bag contains 50 bolts and 150 nuts. Half of the bolts and half of the nuts are rusted. If an item is chosen at random, find the probability that it is rusted or that it is a bolt.

Suppose that 5 males out of 100 and 25 females out of l000 are colour blind. A colour blind person is chosen at random. What is the probability that a male is chosen (assume that the number of males and females are equal)?

Three rotten eggs are mixed with 12 good ones. One egg is chosen at random. What is the probability of choosing a rotten egg?

Three rotten eggs are mixed with 12 good ones. One egg is chosen at random. What is the probability of choosing a rotten egg ?

Two natural numbers x and y are chosen at random. What is the probability that x^(2) + y^(2) is divisible by 5?

A bag contains 6 blue balls and 5 green balls and 2 red balls. A ball is chosen at random. What is the probability of getting a red ball?