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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 good one.

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The correct Answer is:
`11/12`
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VGS PUBLICATION-BRILLIANT-PROBABILITY-EXERCISE 13.2
  1. One card is drawn from a well-shuffled dock of 52 cards. Find the prob...

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

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

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

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

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

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  7. Five cards -the ten , jack queen, king and ace of diamond, are well sh...

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  8. Five cards -the ten , jack queen, king and ace of diamond, are well sh...

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  9. 12 defective pens are accidentally mixed with 132 good ones. IT is no...

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  10. A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at rando...

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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 box contains 90 discs which are numbered from 1 to 90. IF one disc i...

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

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

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

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

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  17. In a bag there are 2 blue and 2 black balls one ball is drawn at rando...

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  18. Two dice are rolled simultaneously and counts are added A student ar...

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

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  20. A dice is thrown twice. What is the probability that (i) 5 will not co...

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