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12 defective pens are accidentally mixed...

12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a goo

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The correct Answer is:
`=(11)/(12)`
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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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