Probability Tes...

A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random from this box. The probability that at least one of these is defective is

Tickets numbered from 1 to 25 are mixed up together and a ticket is drawn at random. What is the probability that the drawn ticket has a prime number?

A card is drawn from a well-shuffled pack of 52 cards. The probability of getting a queen of club or king of heart is

A bag contains 8 white and 5 red balls. Three balls are drawn at random. What is the probability that all the drawn balls are white?

The probability that a leap year selected at random will contain 53 Sundays is

In a lottery of 50 tickets numbered 1 to 50, two tickets are drawn simultaneously. The probability that both the tickets drawn have prime numbers is

Four cards are drawn at random from a pack of 52 cards. The probability of getting all the four cards of the same number is

N cadets have to stand in a row. If all possible permutations are equally likely, the probability of two particular cadets standing side by side is

A bag contains 10 white, 4 green balls. One ball is drawn at random. The probability that it is white is

In a simultaneous throw of two dice, the probability of getting a total of 7 is