anonymous
  • anonymous
A computer has a list of n possible passwords. If only one is accepted, what is the probability of guessing the password right on the first try?
Probability
schrodinger
  • schrodinger
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blurbendy
  • blurbendy
1 / n
anonymous
  • anonymous
thank you. that makes sense. 1/total. However, I am now trying to find the P(correct on 3rd try). Is that P(wrong) * P(wrong) * P(right). if so is that (n-1)/n * (n-1)/(n-1) * 1/(n-2)?
anonymous
  • anonymous
on the second term i mean n-2/n-1

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KingGeorge
  • KingGeorge
Assuming we can't repeat passwords, that looks correct.
anonymous
  • anonymous
ok, so extrapolating to (if i
anonymous
  • anonymous
actually on the last term of the denominator i think it would be n-(i-1)
KingGeorge
  • KingGeorge
I've got to go now, but you certainly could extrapolate like that. To write it exactly, you could do a lot of canceling, or you could write it in product notation using this symbol. \[\prod\]
anonymous
  • anonymous
thank you very much KingGeorge.

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