There are 6 red balls and 4 blue balls in a jar. If 3 balls are selected from the jar, what is the probability that all 3 balls selected are blue balls? Pick:
A) 1/18
B) 1/24
C) 1/30
D) 1/36
E) 1/48
The number of ways of choosing 3 balls from the jar is 10C3 = 120.   The number of ways of choosing 3 blue balls is 4C3 = 4.   P(3 blue balls) = 4/120=1/30.   The answer is 1/30.
<result>C</result>
There are 6 red balls and 4 blue balls in a jar. If 3 balls are selected from the jar, what is the probability that all 3 balls selected are blue balls?