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Probability

Short Answer Type

321.
Cards are marked with numbers 5 to 50 are placed in a box and mixed thoroughly. A card drawn from the box at random. Find the probability that the number on the taken card is
(a) A prime number less than 10
(b) A number which is a perfect square.

Solution not provided.

Ans. $1 over 23 comma space 5 over 46$

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322. If the probability of winning a game is 5/11, what is the probability of loosing it?

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323.

From a bag containing 5 red, 8 black and 7 blue balls, a ball is selected at random. Find the probability that:

(i) it is not a red ball
(ii) it is not a blue ball.

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324. A die is thrown once. Find the probability of getting a number less than 3.

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325. A bag contains 4 red, 58 black and 3 yellow balls. A ball is taken out of the bag at random. Find the probability that the ball taken out is of (i) yellow colour (ii) not of red colour.

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326. A bag contains tickets, numbered 11, 12, 13,..........30. A ticket is taken out from the bag at random. Find the probability that the number on the drawn ticket (i) is a multiple of 7 (iii) is greater than 15 and a multiple of 5.

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327. Two unbiased coins are tossed once. What is the probability of getting exactly one head.

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328.

The king, queen and jack of clubs are removed from a deck of 52 cards and then well shuffled. One card is selected from the remaining card. Find the probability of getting

(a) a heart
(b) a club

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329. Cards each marked with one of the numbers 6, 7, 8,.......... 15 are placed in a box and mixed throughly. One card is drawn at random from the box. What is the probability of getting a card with number less than 10?

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