An urn contains n balls, all different colors. A person draws a ball randomly, records the color before replacing it. The person must record all colors in order to receive a large prize. If m colors have been recorded so far, what is the probability that it will take exactly x draws to get a new color?
Probability Urn Question
0
$\begingroup$
probability
1 Answers
1
Hint: Think of each draw as a Bernoulli trial, with "success" meaning you get a colour that's not one of the $m$ you've already seen.
-
0((N-M)/M)) * ((M/N)^(1-X)) => did not use proper brackets last time. am i correct? – 2011-11-23