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Questions and Answers
Which of the following statements about permutations and combinations is true?
Which of the following statements about permutations and combinations is true?
- Permutations involve selecting objects without replacement, while combinations involve selecting objects with replacement.
- Permutations involve arranging objects in a specific order, while combinations do not consider the order. (correct)
- Permutations and combinations are the same thing.
- Permutations and combinations both involve selecting objects without replacement.
What is the formula for calculating the number of permutations of n objects taken r at a time?
What is the formula for calculating the number of permutations of n objects taken r at a time?
- nPr = n! * (n - r)!
- nPr = n! / (n - r)! (correct)
- nPr = n! * r!
- nPr = n! / r!
In how many ways can a committee of 3 people be formed from a group of 10 people?
In how many ways can a committee of 3 people be formed from a group of 10 people?
- 90
- 30
- 210
- 120 (correct)
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