Find the number of threedigit numerals that can be formed us

Find the number of three-digit numerals that can be formed using the digits 2, 3, 5, 6 and 9, if repetitions are not allowed (e.g. 256 is a three –digit numeral, 232 is a three-digit numeral but number 2 is repeated so 232 is not allowed).

Solution

number of three digit numerals without repetation

= 5 * 4 * 3

= 60

since there are 5 distinct digits and 3 must be choosen

or 5P3 = 60