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madison712

  • 3 years ago

You have 4 math books, 3 english books, and six science books. If you select books at random what is the probability of picking 3 english books?

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  1. Ganpat
    • 3 years ago
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    how many books u have ??

  2. Ganpat
    • 3 years ago
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    @madison712 : lets do it together.. hope u dont mind..

  3. xoya
    • 3 years ago
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    may be 13 :/

  4. Ganpat
    • 3 years ago
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    add all them together.. you will get total number of books..

  5. Ganpat
    • 3 years ago
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    you have total of 6+4+3 = 13 books.. now, picking book and it shd be English.. so u have 3 English books.. So the probability would be 13C3...

  6. xoya
    • 3 years ago
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    even i think you are right :)

  7. amistre64
    • 3 years ago
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    probabilities aint greater than 1

  8. amistre64
    • 3 years ago
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    i think a hypergeometric probability might be more condusive

  9. amistre64
    • 3 years ago
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    \[\large\frac{\binom{M}{k}\binom{N-M}{n-k}}{\binom{N}{n}}\]

  10. Ganpat
    • 3 years ago
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    oh sorry.. small mistake..

  11. Ganpat
    • 3 years ago
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    it should be 3/13...

  12. Ganpat
    • 3 years ago
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    @amistre64 : ?? what say ?

  13. amistre64
    • 3 years ago
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    or one way of looking at it might be if we put all 13 books into a box; the probability of picking an E in the first go around is: 3/13 out of the remaining 12 books ; the probability of picking an E in the 2nd go around is: 2/12 out of the remaining 11 books ; the probability of picking an E in the 3rd go around is: 1/11 P(A and B and C) = P(A) * P(B) * P(C)

  14. Ganpat
    • 3 years ago
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    hmmm, agree.. i thought, just one book.. thnx !!!

  15. amistre64
    • 3 years ago
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    youre welcome

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