Multiple choice general knowledge science & technology

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 starting from the right of the shelf. The number of different orders in which books A, B and E may be arranged is

  1. 5!

  2. 3!

  3. 2! * 3!

  4. 2!

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Books C and D are fixed at specific positions from the right. The remaining 3 books (A, B, E) can be arranged in any order among themselves. The number of permutations of 3 items is 3! = 6.