Mathematics · Permutations and Combinations
Five different books (A, B, C, D, and E) are to be arranged on a shelf. Books C and D are to be arranged first and second respectively, starting from the right side of the shelf. The number of different orders in which books A, B, and E may be arranged is:
- 15!
- 23!✓
- 32!
- 43! × 2!
Correct answer
3!
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