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A lot consists of 144 ball pens of which...

A lot consists of 144 ball pens of which 20 are defective and the others are good. Nuri will buy a pen if it is good, but will not buy if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that (i

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The correct Answer is:
`=(31)/(36)`, `(5)/(36)`
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A lot consists of 144 ball pens of which 20 are defective and others good.Nuri will buy a pen if it is good,but will not buy if it is defective. The shopkeeper draws one pen at random and gives it to her.What is the probability that (i) She will buy it? (ii) She will not buy it?

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OSWAL PUBLICATION-PROBABILITY-NCERT CORNER ( Exercise-15.1)
  1. One card is drawn from a well-shuffled deck of 52 cards. Find the prob...

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

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

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  4. Five cards - the ten, jack, queen, king and ace of diamonds, are well-...

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  5. Five cards the ten, jack, queen king and ace of diamonds, are well...

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  6. 12 defective pens are accidentally mixed with 132 good ones. It is ...

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  7. A lot of 20 bulbs contains 4 defective ones. One bulb is drawn at rand...

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

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

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

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

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

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

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

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  15. Refer to Example 13. (i) Complete the following table (ii) A student ...

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  16. A game consists of tossing a one-rupee coin three times and noting its...

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  17. A die is thrown twice. Find the probability that: 5 will not come up...

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  18. A die is thrown twice. Find the probability that: 5 will come up at ...

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  19. Examine, If two coins are tossed at the same time, there are 3 poss...

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  20. State true or false and justify “If a die is thrown, there are two ...

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