Results 1 to 2 of 2

Math Help - Probability question involving bank PIN numbers. P

  1. #1
    Junior Member
    Joined
    Oct 2010
    Posts
    34

    Probability question involving bank PIN numbers. P

    "Bank of america customers select their own personal three digit identification for use at ATM's. What is the probability that Mr. Jones and Mrs. Smith select the same PIN?"

    My approach is >

    Since we have the PIN is made of three digits, for each digit, we could choose any number from 0-9. So the number of all possible PIN's that could be selected is 10x10x10=1000
    The restriction is that Mr. Jones and Mrs. Smith will have the PIN. They could have any PIN, but it must be the same. So, one of them has the choice to choose "any" PIN. The other one has to choose the same PIN.

    Hence if P(Smith)= Probability of Smith choosing any PIN=1
    and if P(Jones)= Probability of Jones choosing PIN chosen by smith=(1/1000)

    Then, P(Smith and Jones)= Probability of smith and Jones choosing the same pin=(1)(1/1000) =1/1000

    Is this correct???
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member Barioth's Avatar
    Joined
    Jan 2013
    From
    Canada
    Posts
    54
    Thanks
    16

    Re: Probability question involving bank PIN numbers. P

    Look good to me, since the number chosed by each other seems independant event P(A and B) = P(A)*P(B)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Question involving complex numbers
    Posted in the Algebra Forum
    Replies: 6
    Last Post: November 17th 2012, 01:14 AM
  2. Bank/interest question
    Posted in the Algebra Forum
    Replies: 1
    Last Post: March 19th 2011, 08:04 PM
  3. [SOLVED] Combinatorics question involving summing digits of numbers
    Posted in the Discrete Math Forum
    Replies: 5
    Last Post: January 29th 2011, 07:21 AM
  4. Probability involving two digit numbers.
    Posted in the Statistics Forum
    Replies: 5
    Last Post: January 24th 2011, 01:33 PM
  5. Probability question involving r-digit numbers
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: September 21st 2010, 08:45 PM

Search Tags


/mathhelpforum @mathhelpforum