AMC / AIME · Permutations · Easy

Permutations: How many math-digit numbers can be made from math without repetition?

Ordered arrangements.

Try the problem

How many 33-digit numbers can be made from 1,2,31,2,3 without repetition?

Hint and answer

Concept to use

$n!$.

Hint

Order matters: use a falling product.

Answer

6

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