From a Nine-member dance group, four will be chosen at random to volunteer at a youth dance event. If Kori and Jason are two of the nine members, what is the probability that both will be chosen to volunteer?
Answers
A) a) 1/21
B) b) 1/7
C) c) 4/21
D) d) 2/7
E) e) 1
Total number of ways to choose 4 out of 9 = 9C4 = 2520.   Number of ways to choose 2 (any but Kori and Jason) out of 7 (excluding Kori and Jason) = 7C2 = 2520.   P = favorable/total = 2520/2520= 
<gadget id="calculator">2520/2520</gadget>
<output>1</output>
1.   Answer: e) 1.
<result>E</result>
From a Nine-member dance group, four will be chosen at random to volunteer at a youth dance event. If Kori and Jason are two of the nine members, what is the probability that both will be chosen to volunteer?