From a nine-member dance group, six will be chosen at random to volunteer at a youth dance event. If Kori and Jason are three of the nine members, what is the probability that three will be chosen to volunteer?  Choose the correct choice:
A) a) 1/21	B) b) 100/7	C) c) 4/21	D) d) 2/7	E) e) 3/7
Total number of ways to choose 6 out of 9 = 9C6 = 21/5.   Number of ways to choose 3 (any but Kori and Jason) out of 6 (excluding Kori and Jason) = 6C3 = 60.   P = favorable/total = 60/(21/5) = 100/7.   Answer: b) 100/7.
<result>B</result>
From a nine-member dance group, six will be chosen at random to volunteer at a youth dance event. If Kori and Jason are three of the nine members, what is the probability that three will be chosen to volunteer?