Just make a list . . .
Two balls are drawn. .There are eight possible outcomes:A box contains 1 red, 2 white and 4 blue balls. .Two balls are drawn without
replacement, noting the color of each. .If the first two balls drawn are white
and blue in either order, then one more ball is drawn, and its color noted.
Determine the number of elements in the sample space for this experiment.
In the first six outcomes, the experiment is over.
In the last two outcomes, a third ball is drawn.
. . It could be
Hence, there are: . three-draw outcomes.
The number of outcomes is: .