JAMB - Mathematics (2013 - No. 28)
In how many ways can a student select 2 subjects from 5 subjects?
\(\frac{5!}{3!}\)
\(\frac{5!}{2!2!}\)
\(\frac{5!}{2!3!}\)
\(\frac{5!}{2!}\)
คำอธิบาย
A student can select 2 subjects from 5 subjects in;
5C3 ways, i.e. = \(\frac{5!}{2!(5 - 2)!}\)
= \(\frac{5!}{2!3!}\)
5C3 ways, i.e. = \(\frac{5!}{2!(5 - 2)!}\)
= \(\frac{5!}{2!3!}\)