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A and B stand in a ring with 10 other pe...

A and B stand in a ring with 10 other persons . If the arrangement of the twelve persons is at random , find the chance that there are exactly three persons between A and B.

A

`2//11`

B

`9//11`

C

`1//11`

D

none of these

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-PROBABILITY -Section I - Mcqs
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  6. If p is the probability that a man aged x will die in a year, then the...

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  8. If the letters of the word MISSISSIPPI are written down at random i...

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  10. If the letters of the word REGULATIONS be arranged at random, find t...

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  11. A bag contains a white and b black balls. Two players, Aa n dB alterna...

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  12. Two number aa n db aer chosen at random from the set of first 30 natur...

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  13. Cards are drwn one by one without replacement from a pack of 52 cards....

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  14. If A and B are independent events, then A' and B' are also

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  15. A bag contains 4 tickets numbered 1, 2, 3, 4 and another bag contains ...

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  16. A six-faced dice is so biased that it is twice as likely to show an ev...

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  17. A bag contains an assortment of blue and red balls. If two balls are ...

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  18. A single letter is selected at random from the word PROBABILITY. Wh...

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  19. Three letters are written to different persons , and the addresses on ...

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