Question 28
Back to Exercise
3 different maths books and 2 different physics books are put on a shelf so that books of each subject stay together. In how many ways?
- A 120
- B 12
- C 24 Correct
- D 72
Correct Answer: Option C
Order of subjects: 2!
Maths among themselves 3!, physics 2!
2 × 6 × 2 = 24
Trap: 12 forgets that the subjects can swap.
Answer: 24
Discussion & Comments 0
Share your method, a shortcut, or ask about a step you didn't follow.
No comments yet. Be the first to share your solution!