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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 drawn one pen at random and gives it to her. What is the probability that
She will buy it?

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The correct Answer is:
` = 31/36`
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SUBHASH PUBLICATION-PROBABILITY-EXERCISE 14.1
  1. One card is drawn from a well - shuffied deck of 52 cards. Find the ...

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

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  3. Five cards - the ten , jack , queen , king and ace of diamonds, are we...

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

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  5. 12 defective pens are accidentally mixed with 132 good ones. It is not...

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

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  7. Suppose the bulb drawn in (i) is not dective and is not replaced . Now...

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

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

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

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  12. Suppose you drop a die at random on the rectangular region . What is t...

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

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

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  15. Complete the following table : {:("Event: 'Sum on 2 dice'",2,3,4,5,6...

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

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  17. A die is thrown twice. What is the probability that 5 will not come...

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  18. A die is thrown twice. What is the probability that 5 will come up a...

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

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

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