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madison712 Group Title

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?

  • one year ago
  • one year ago

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  1. Ganpat Group Title
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    how many books u have ??

    • one year ago
  2. Ganpat Group Title
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    @madison712 : lets do it together.. hope u dont mind..

    • one year ago
  3. xoya Group Title
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    may be 13 :/

    • one year ago
  4. Ganpat Group Title
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    add all them together.. you will get total number of books..

    • one year ago
  5. Ganpat Group Title
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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...

    • one year ago
  6. xoya Group Title
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    even i think you are right :)

    • one year ago
  7. amistre64 Group Title
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    probabilities aint greater than 1

    • one year ago
  8. amistre64 Group Title
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    i think a hypergeometric probability might be more condusive

    • one year ago
  9. amistre64 Group Title
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    \[\large\frac{\binom{M}{k}\binom{N-M}{n-k}}{\binom{N}{n}}\]

    • one year ago
  10. Ganpat Group Title
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    oh sorry.. small mistake..

    • one year ago
  11. Ganpat Group Title
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    it should be 3/13...

    • one year ago
  12. Ganpat Group Title
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    @amistre64 : ?? what say ?

    • one year ago
  13. amistre64 Group Title
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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)

    • one year ago
  14. Ganpat Group Title
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    hmmm, agree.. i thought, just one book.. thnx !!!

    • one year ago
  15. amistre64 Group Title
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    youre welcome

    • one year ago
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