Test Index

JAMB Mathematics 2013 Paper

Question : 28

Total: 47

In how many ways can a student select 2 subjects from 5 subjects?

Solution:

Concept:

Choosing subjects is a combination problem because the order of selection does not matter.

Explanation:

The number of ways to select 2 subjects from 5 is

^5C_2

Use the combination formula:

^nC_r = \frac{n!}{r!(n-r)!}

Here,

n = 5

and

r = 2

So,

^5C_2 = \frac{5!}{2!(5-2)!}

This simplifies to

\frac{5!}{2!3!}

Therefore, the correct option is C.

Answer:

\frac{5!}{2!3!}

ways.

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