# Question: an urn contains 6 red 9 green and 11 blue...

###### Question details

An urn contains 6 red, 9 green, and 11 blue balls. The following is repeated 3 times: a ball is selected from the urn at random and removed (called “sampling without replacement”). Give your answers to 3 significant digits.

(a) What is the probability that all 3 selected balls are the same color?

(b) What is the probability that all 3 selected balls are different colors?

(c) Repeat part (a) assuming “sampling with replacement”. That is, the following is repeated 3 times: a single ball is selected from the urn at random, its color is noted, then it is returned to the urn before the next ball is drawn.

(d) Repeat part (b) assuming sampling with replacement