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How many different three-digit numbers can be written using the digits 4 5 6 and 7 use each digit only oncein a number?
Wiki User
∙ 13y ago
Use the permutation (no repetition) formula: n! / (n-r)!, where ! is the factorial. Factorial of n = n * (n-1) * (n-2) * ...* 1.
n = 4, because there are 4 items. r = 3 because you take them 3 at a time.
4! / (4-3)! = 4! / 1! = 4 * 3 * 2 * 1 = 24
Wiki User
∙ 13y ago
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