alleryStart learning →What is a permutation?
AA selection in which order does not matter
BA selection of objects in which order matters
CA selection made without replacing objects
DA selection that keeps every object unused
Answer & Solution
Correct answer: B. A selection of objects in which order matters
1. A permutation is an ordering of objects, so rearranging them produces a different permutation.
2. Lining up for a photograph or awarding first, second and third place are permutation problems.
3. A selection where order does not matter is a combination instead.
4. Whether objects are replaced is a separate question, so that description does not define a permutation.
_Source: OpenStax Algebra and Trigonometry (CC BY 4.0), Ch 13 "Sequences, Probability and Counting Theory", section 13.5 Counting Principles_
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