JAMB - Mathematics (2002 - No. 38)
How many three-digit numbers can be formed from 32564 without repeating any of the digits?
120
10
20
60
説明
To get the answer, we simply do
\(\frac{5!}{(5 - 3)!}\)
= \(\frac{5 \times 4 \times 3 \times 2 \times 1}{2 \times 1}\)
= 60