In your study are displayed your 5 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 ?
Pick one:
A) 1 hour  B) 2 hours  C) 3 hours  D) 4 hours  E) 5 hours
Possible arrangements are 5*4*3*2*1= 
<gadget id="calculator">5*4*3*2*1</gadget>
<output>120</output>
120   For making a new arrangement , two books are required to be moved.   so total 120*2= 
<gadget id="calculator">120*2</gadget>
<output>240</output>
240 mins which will take 240 min or 4 hours.   ANSWER:4 hours
<result>D</result>
In your study are displayed your 5 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 ?