Mathematics · Set Theory & Combinatorics
Let a set A have m elements, a set B have n elements, and let m ≤ n. What is the number of one-one functions from A to B?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1mn
- 2n!(n - m)!✓
- 3n!m!(n - m)!
- 4nm
Correct answer
n!(n - m)!
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