Suppose you want to arrange your English, Hindi, Mathematics, History, Geography and Science books on a shelf. In how many ways can you do it ? Select.
A) 520 B) 720 C) 920 D) None E) Cannot be determined
We have to arrange 6 books. The number of permutations is  6*5*4*3*2*1= 
<gadget id="calculator"> 6*5*4*3*2*1</gadget>
<output>720</output>
720   Answer : 720
<result>B</result>
Suppose you want to arrange your English, Hindi, Mathematics, History, Geography and Science books on a shelf. In how many ways can you do it ?