Question

How many five digit numbers can be formed by using the digits $1,2,3,4,5$ without repetition of digits?

• A. $120$
• B. $240$
• C. $150$
• D. $160$

Answer 1

The correct option is A $120$

$1,2,3,4,5$

Number of given digits $=5$

Number of Digited number to be formed $=5$

Number of such numbers

${}^5{P}_5=\frac{5!}{0!}=5!=120$

Number of such numbers $=120$