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Thread: Is this a permutation?

  1. October 12th 2010, 12:38 PM #1
    terminator
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    Is this a permutation?

    John has forgotten his password to log on his computer. He knows the password is made up of 5 letters in the word "speed". What is the maximum number of passwords Greg has to check to find the right one?

    24
    60
    120
    240

    is 5! or 5!/2! ??
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  2. October 12th 2010, 12:40 PM #2
    Plato
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    Because of the two e's it is \dfrac{5!}{2}
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