AMC / AIME · Permutations · Easy
Permutations: How many math-letter strings without repetition use math?
Ordered arrangements.
Try the problem
How many -letter strings without repetition use ?
Hint and answer
Concept to use
$n!$.
Hint
Order matters: use a falling product.
Answer
12
More Permutations problems
Practice more with the free Permutations worksheet generator, or browse the full problem library.