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Class XII Maths Probability 4

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Question 1

If two dice are tossed 6 times, then what is the probability that the sum of numbers obtained on the top is 7, in exactly four of the tosses?

Question 2

A purse contains 4 copper coins and 3 silver coins, the second purse contains 6 copper coins and 2 silver coins. If a coin is drawn out of any purse, then the probability that it is a copper coin is

Question 3

The probabilities of solving a problem by three students A, B and C are 1/2, 3/4 and 1/4 respectively. The probability that the problem will be solved is

Question 4

Two decks of playing cards are well shuffled and 26 cards are randomly
distributed to a player. Then the probability that the player gets all distinct cards is

Question 5

An urn contains 8 red and 5 white balls. Three balls are drawn at random. Then the probability that balls of both colours are drawn is

Question 6

A box contains 100 bulbs, out of which 10 are defective. A sample of 5 bulbs is drawn. The probability that none is defective is

Question 7

Cards are drawn one-by-one without replacement from a well shuffled pack of 52 cards. Then the probability that a face card (Jack, Queen or King) will appear for the first on the third turn is equal to

Question 8

A person goes to office by car or scooter or bus or train, the probability of which are 1/7, 3/7, 2/7 and 1/7 respectively. The probability that he reaches office late, if he takes car, scooter, bus or train is 2/9, 1/9, 4/9 and 1/9 respectively. Given that he reached office on time, the probability that he traveled by car is n/7. Then n=

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Dec 11JEE & BITSAT