Between two book ends in your study are displayed your five favourite puzzle books. If you decide to arrange the five books in every possible combination and moved just one book every minute, how long would it take you?

• Clearly, number of ways arranging 5 books,
  = 5! = 5 × 4 × 3 × 2 × 1 = 120.
  So total time taken = 120 minutes = 2 hours.
• 12 years agoHelpfull: Yes(24) No(0)
• no. of ways=5!
  5!=5*4*3*2*1=120
  So 2 hours are taken..
• 12 years agoHelpfull: Yes(2) No(0)
• 5p5 = 5*4*3*2*1 (without repetition)
  = 120
  let transferring one book consumes 1 sec then 120 shifts = 120 secs i.e,. 2hours
• 12 years agoHelpfull: Yes(1) No(0)
• no of ways of arranging 5 books=5!=120
  tym req for 1 arrngement=1 min
  so tym req for 120 arrangements=120*1=120 mins=120/60=2hrs
• 12 years agoHelpfull: Yes(1) No(0)