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If m rupee coins and n ten paise coins a...

If m rupee coins and n ten paise coins are placed in a line, then the probability that the extreme coins are ten paise coins, is

A

`(m(m-1))/((m+n)(m+n-1))`

B

`(n(n-1))/((m+n)(m+n-1))`

C

`(m(n-1))/((m+n)(m+n-1))`

D

none of these

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The correct Answer is:
B
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FIITJEE-PROBABILITY-ASSIGNMENT PROBLEMS (OBJECTIVE) LEVEL-I
  1. Two events Aa n dB have probabilities 0.25 and 0050, respectively. The...

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  2. If the probability of choosing an integer k out of '2m' integers 1,2,3...

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  3. If m rupee coins and n ten paise coins are placed in a line, then the ...

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  4. The probability that atleast one of the events A and B occurs is 0.6 I...

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  5. Let A and B be two events such that P(A cap B')=0.20,P(A'cap B)=0.15, ...

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  6. Two numbers are selected randomly from the set S={1,2,3,4,5,6} without...

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  7. An unbiased die with faced marked 1, 2, 3, 4, 5, and 6 is rolled four ...

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  8. Three numbers are selected at random one by one with replacement from ...

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  9. Three identical dice are rolled once. The probability that the same nu...

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  10. Let three numbers be A=2^2 xx 3^3 xx 5, B =7^2 xx 13 xx 17, C = 2xx 3 ...

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  11. If two subsets A and B of set S containing n elements are selected at ...

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  12. One boy can solve 60%of the problem in a book and another can solve 80...

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  13. Three dice are rolled. The probability that different numbers will app...

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  14. A speaks truth in 605 cases and B speaks truth in 70% cases. The proba...

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  15. The probabilities of solving a problem correctly by A and B are (1)/(8...

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  16. Four die are thrown simultaneously. The probability that 4 and 3 appea...

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  17. A positive integer 'n' not exceeding 100, is chosen in such a way that...

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  18. Two boxes containing 20 balls each, and each balls is either black or ...

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  19. Four identical oranges and six distinct apples (each a different varie...

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  20. Four identical dice are rolled once. The probability that atleast diff...

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