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There are four machines and it is known ...

There are four machines and it is known that exactly two of them are faulty . They are tested one by one, in a random order till the faulty machines are identified . The the probability that only two tests are needed is

A

`1//3`

B

`1//6`

C

`1//2`

D

`1//4`

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-PROBABILITY-EXERCISE-1C
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  8. A,B,C are tossing a coin on the condition that , the person who gets a...

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  9. The person, A in order toss a die. The person who throws 5 or 6 wins. ...

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  10. 2 white balls and 3 blanks balls and 3 blank balls are placed in a bag...

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  11. Three white balls and five blacks balls are placed in a bag and three ...

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  12. A bag contains 6 white and 4 black balls. Two ball are drawn at rando...

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  13. A fair die is thrown until a score of less than five points is obtaine...

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  14. A man throws a die until he gets a number bigger than 3. The probabili...

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  15. On a toss of two dice, A throws a total of 5. Then the probability tha...

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  16. A and B throw a pair of dice. A wins if the throws 6 before B throws 7...

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  17. A die is rolled three times, the probability of getting a larger numbe...

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  18. A man alternately tosses a coin and throws a die beginning with the co...

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  19. In each of a set of games it is 2 to 1 in favour of the winner of the ...

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