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A box contains 90 discs which are number...

A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears (i) a two-digit number (ii) a perfect square number (iii) a number divisible by 5.

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The correct Answer is:
(1) `P(A) = 81/90 = 9/10`
(2) `P(B) = 9/90 = 1/10`
(3) `P(C ) = 18/90 =1/5`
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KUMAR PRAKASHAN-PROBABILITY -EXERCISE 15.1
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  2. It is given that in a group of 3 students, the probability of 2 stu...

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  3. A bag contains 3 red balls and 5 black balls. A ball is drawn at ra...

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  4. A box contains 5 red marbles, 8 white marbles and 4 green marbles. One...

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  5. A piggy bank contains hundred 50p coins, fifty Rs. 1 coins, twenty ? ...

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  6. Gopi buys a fish from a shop for his aquarium. The shopkeeper takes o...

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  7. A game of chance consists of spinning an arrow which comes to rest ...

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  8. A die is thrown once. Find the probability of getting (i) a prime numb...

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  9. One card is drawn from a well-shuffled deck of 52 cards. Find the prob...

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  10. Five cardsthe ten, jack, queen, king and ace of diamonds, are well ...

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  11. 12 defective pens are accidentally mixed with 132 good ones. It is ...

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  12. (i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn a...

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  13. A box contains 90 discs which are numbered from 1 to 90. If one disc ...

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  14. A child has a die whose six faces show the letters as given below: ...

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  15. Suppose you drop a die at random on the rectangular region shown in...

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  16. A lot consists of 144 ball pens of which 20 are defective and the o...

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  17. (1) Complete the following table : (2) A student argues that 'the...

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  18. A game consists of tossing a one rupee coin 3 times and noting its ...

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  19. A die is thrown twice. What is the probability that (i) 5 will not...

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  20. Which of the following arguments are correct and which are not corr...

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