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In how many ways can 2 students be selected from a group of 5 students...

Mathematics
JAMB 2021

In how many ways can 2 students be selected from a group of 5 students in a debating competition?

  • A. 25 ways
  • B. 10 ways
  • C. 15 ways
  • D. 20 ways
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Correct Answer: Option B
Explanation

\(In\hspace{1mm} ^{5}C_{2}\hspace{1mm}ways\hspace{1mm}=\frac{5!}{(5-2)!2!}\\=\frac{5!}{3!2!}\\=\frac{5\times4\times3!}{3!\times2\times1}\\=10\hspace{1mm}ways\)

There is an explanation video available below.


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Explanation Video

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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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