Four balls are selected at random without replacement from an urn containing four white balls and five blue balls. Find the probability of the given event.

Question

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All of the balls are blue.

Answer 1

4 w and 5 b so 9

first one
5/9
second
4/8
third
3/7
fourth
2/6
so
5/9 * 1/2 * 3/7 * 1/3
(5)/(7*18) = 5/126

Answer 2

Right