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A final examination requires that a student answer any 4 out of 6 questions. In...

Mathematics
JAMB 2006

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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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Correct Answer: Option A
Explanation
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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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789

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Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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