Exam-style question
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How many permutations are there of four distinct objects?.
- A.4
- B.8
- C.16
- D.24
Model answer
What a good answer should say
- 24
Explanation
Why this works
The number of permutations of n distinct objects is n!. Therefore, 4!
= 4 × 3 × 2 × 1 = 24.
Common mistake
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