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anonymous

  • one year ago

the number of arrangements can be made taking 4 letters at a time out of the letters of the word PASSPORT

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  1. dan815
    • one year ago
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    P,A,S,O,R,T P S

  2. dan815
    • one year ago
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    case1) no repeating letters case2)repeating Ps only case3)repeats S only case4)repeating P and s

  3. dan815
    • one year ago
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    case1)=6! case2)=5*4*(4choose2) case3) =5*4*(4choose2) case4) = (4 choose 2)

  4. anonymous
    • one year ago
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    In the case one, should't it be 6 x 5 x 4 x 3 and not 6 ! and can you please explain the last case?

  5. anonymous
    • one year ago
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    @dan815

  6. dan815
    • one year ago
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    that should be 6*5*4*3 yes thats a mistake

  7. dan815
    • one year ago
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    the last case we are looking at P,P,S,S how many ways to arrange that

  8. dan815
    • one year ago
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    thats 4!/(2!2!)

  9. anonymous
    • one year ago
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    And in case 2 and 3 it will be like : 5 x 4 x 4!/2! x 2! ? Why 4!/2! x 2! ? ( that will be similar as case 4 then? @dan815

  10. dan815
    • one year ago
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    yeah because

  11. dan815
    • one year ago
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    uh its too much to explain typing =.=

  12. dan815
    • one year ago
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    just think about it lol

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