Results 1 to 8 of 8

Math Help - [SOLVED] Simple Probability Help

  1. #1
    Junior Member
    Joined
    Oct 2008
    Posts
    29

    [SOLVED] Simple Probability Help

    If a dice is rolled three times, what is the probability of rolling a 3 at least once?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Feb 2009
    Posts
    38
    You would have to do (1/6)(1/6)(1/6) to get your answer.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Oct 2008
    Posts
    29
    That would be the probability of rolling a 3 three times though, i'm looking for the probability of rolling at LEAST one 3.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Junior Member
    Joined
    Feb 2009
    Posts
    38
    It would be A(prime) = 1 - (1/6)^3
    = 216/216 - 1/216
    = 215/216
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Oct 2008
    Posts
    29
    That's the probability of not rolling a 3 three times in a row.

    Btw, the answer is supposed to be 91/216.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Senior Member pankaj's Avatar
    Joined
    Jul 2008
    From
    New Delhi(India)
    Posts
    317
    First,find the probability that no six occurs in 3 throws,which will be equal to =(\frac{5}{6})(\frac{5}{6})(\frac{5}{6})=(\frac{5}  {6})^3
    Therefore the probability that at least one six occurs will be
     <br />
=1-(\frac{5}{6})^3=\frac{91}{216}<br />
    Follow Math Help Forum on Facebook and Google+

  7. #7
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,605
    Thanks
    1574
    Awards
    1
    Quote Originally Posted by zerobladex View Post
    If a dice (it should be die) is rolled three times, what is the probability of rolling a 3 at least once?
    If we roll a die three times the probability of no 3's is \left({\frac{5}{6}}\right)^3.
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Junior Member
    Joined
    Oct 2008
    Posts
    29
    LOL, I forgot that dice is plural.

    Thanks for the help though guys!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Simple probability problem
    Posted in the Discrete Math Forum
    Replies: 4
    Last Post: May 4th 2010, 01:13 PM
  2. [SOLVED] Simple Probability has me stumped
    Posted in the Statistics Forum
    Replies: 25
    Last Post: August 28th 2009, 01:39 PM
  3. [SOLVED] Simple probability question
    Posted in the Statistics Forum
    Replies: 2
    Last Post: March 24th 2009, 05:09 AM
  4. [SOLVED] Simple Probability Question (Programming)
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: February 23rd 2009, 05:55 PM
  5. [SOLVED] Simple Probability
    Posted in the Statistics Forum
    Replies: 2
    Last Post: February 2nd 2009, 04:29 AM

Search Tags


/mathhelpforum @mathhelpforum