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

A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? Suppose the bulb is drawn is previous case 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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The correct Answer is:
`15/19`
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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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