A final examination requires that a student ans... - JAMB Mathematics 2006 Question
A final examination requires that a student answer any 4 out of 6 questions. In how many ways can this be done?
A
15
B
20
C
30
D
45
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Correct Option: A
The question will be answered in
(^5C_4 = \frac{6!}{(6-4)!4!}=\frac{6!}{2!4!}=\frac{6\times5\times4!}{2\times1\times4!}=15\hspace{1mm}ways)
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