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Questions and Answers
What is the formula to calculate the number of permutations of n objects taken r at a time?
What is the formula to calculate the number of permutations of n objects taken r at a time?
- nPr = n! / (n - r)! (correct)
- nPr = (n - r)!
- nPr = n! / r!
- nPr = n! * r!
What is the fundamental difference between permutations and combinations?
What is the fundamental difference between permutations and combinations?
- Permutations consider the order of arrangement, while combinations do not. (correct)
- Permutations always result in a larger number than combinations.
- Permutations involve only distinct objects, while combinations involve identical objects.
- Permutations can be calculated using factorials, while combinations cannot.
In how many ways can 5 people be arranged in a line?
In how many ways can 5 people be arranged in a line?
- 120 (correct)
- 60
- 24
- 20
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