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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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OSWAAL PUBLICATION-PROBABILITY -TEXTBOOK CORNER (EXERCISE 14.1)
  1. If P (E) = 0.05, what is the prabability of 'not' E' ?

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  2. A bag contains lemon flavoured candies only . Malini takes out one can...

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  3. It is given that in a group of 3 students, the probability of 2 studen...

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  4. A bag contains 5 red balls and some blue balls. If the probability of ...

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

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  6. A piggy bank contains hundred 50p coins , fifty Rs 1 coins twenty Rs 2...

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  7. Gopi buys a fish from a shop for his aquarium. The shopkeeper takes ou...

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

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  9. A die is thrown once, Find the probability of getting (i) a prime nu...

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  10. One card is drawn fram a well shuffled deck of 52 cards. Find the prob...

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  11. Five cards - then ten, jack, queen, king and ace of diamonds, are well...

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  12. 12 defective pens are accidentally mixed with 132 good ones. It is not...

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  13. (i) A lot of20 bulbs sontains 4 defective ones. One bulb is drawn at r...

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

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

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  16. Suppose you drop a die at random on the rectangular region . What is t...

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  17. A lot consists of 144 ball pens of which 20 are defective and the othe...

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

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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 correct...

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