1. What is the probability that a leap year has 53 Sundays and 52 Mondays?
2. A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is -
3. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are picked at random, what is the probability that they are all blue?
4. In a party there are 5 couples. Out of them 5 people are chosen at random. Find the probability that there are at the least two couples?
5. If a number is chosen at random from the set {1, 2, 3, ......., 100}, then the probability that the chosen number is a perfect cube is -
6. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are drawn what is the probability that one is yellow and two are red?
7. From a pack of cards two cards are drawn one after the other, with replacement. The probability that the first is a red card and the second is a king is -
8. A coin is tossed live times. What is the probability that there is at the least one tail?
9. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow?
10. 10 books are placed at random in a shelf. The probability that a pair of books will always be together is -
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