"mat" <mats_trash at hotmail.com> wrote in message
news:43525ce3.0207180723.642fd8f9 at posting.google.com...
> >
> > If you're asked a question which has four multiple choice answers, and
you
> > haven't got a clue what the answer is, what is the probability of
getting a
> > correct answer? Since you have once chance in four of getting the right
> > answer, your probability is 0.25. If you guess on two questions, your
> > probability is .5, and three it's .75, and four, it's 1.0.
>> So you are certain to get a correct answer if you guess on four
> questions? and you claim to understand probability?!
>> P(one questions correct given 4 choices and if guessing) = 0.25
> P(two questions correct) = 0.25 x 0.25 = 0.0625
> P(three questions correct) = 0.25 x 0.25 x 0.25 = 0.015625
> .
> .
> .
> P(n questions correct) = 0.25^n
Actually, he was talking about getting only one correct, as far as I can
tell. He's still wrong though.
