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A lot of 20 bulbs contain 4 defective on...

A lot of 20 bulbs contain 4 defective ones. One bulbs is drawn at random from the lot.Suppose the bulb drawn in (i) is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?

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R G PUBLICATION-PROBABILITY-EXERCISE
  1. 12 defective pens are accidentally mixed with 132 good ones.It is not ...

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  2. A lot of 20 bulbs contain 4 defective ones. One bulbs is drawn at rand...

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  3. A lot of 20 bulbs contain 4 defective ones. One bulbs is drawn at rand...

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

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

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

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

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

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

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

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

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

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  13. A die is throw twice. What is the probability that (i) 5 will come up ...

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  14. A die is throw twice. What is the probability that (ii) 5 will come up...

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  15. Which of the following arguments are correct and which are not correct...

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  16. Which of the following arguments are correct and which are not correct...

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  17. Two customers Shyam and Ekta are visiting a particular shop in the sam...

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  18. Two customers Shyam and Ekta are visiting a particular shop in the sam...

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  19. Two customers Shyam and Ekta are visiting a particular shop in the sam...

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  20. A bag contains red balls and some blue balls. If the probability of dr...

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