In your bookshelf, you have five favorite books. If you decide to arrange these five books in every possible combination and moved just one book in every half a minute. How much time it will take you to arrange?

Question: In your bookshelf, you have five favorite books. If you decide to arrange these five books in every possible combination and moved just one book in every half a minute. How much time it will take you to arrange?Solution:5 books can be arranged in = 5! ways= 5 × 4 × 3 × 2 × 1 = 120 waysNow,Time per arrangement 1 move = 1/2 minuteSo, total time required is = 120 × (1/2) = 60 minute = 1 hour