Permutations
1. Which of the following is the number of ways to arrange 4 objects taken all at a time?
2. In how many ways can you arrange the letters A, B, C, D so that A is always first?
3. Which of the following is a valid permutation of the set {1, 2, 3}?
4. Which of the following is NOT a permutation?
5. Which algorithmic technique is commonly used to generate all combinations or permutations?
6. Which of the following statements about permutations is TRUE?