Mathematics · Permutations and Combinations
Let r and n be integers such that 1 ≤ r ≤ n. If A is a set with r elements and B is a set with n elements, then the number of injective functions (injections) from A to B is equal to:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1nCr
- 2n × r
- 3nPr✓
- 4nr
Correct answer
nPr
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