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In how many ways can 6coloured chalks be arranged if 2 are same colour?

Mathematics
JAMB 2005
In how many ways can 6coloured chalks be arranged if 2 are same colour?
  • A. 60
  • B. 120
  • C. 240
  • D. 360
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Correct Answer: Option D
Explanation
\(\frac{6!}{2!}=ways=\frac{6\times5\times4\times3\times2!}{2!}\\=6\times5\times4\times3\\=360\hspace{1mm}ways\)
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Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
Join your school's WhatsApp group
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
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
Join your school's WhatsApp group
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts