There are three piles of books A,B and C having 3,4,5 books respectively.These books have to be picked up and put in a shelf one by one.How many possible sequence can be formed in the shelf if a book can be picked only from top of any pile?
options
1)12! 2)3!*4!*5! 3) 12C3*9C4 4)12^12

• SINCE WE SHOULD FILL ONLY FROM TOP.........12! IS NOT CORRECT
  WE HAVE POSSIBILTY OF FILLING ALL 5 FROM C AND GO TO A,B 0R 1 EACH FROM EACH PILE OR 2..........SO 3!*4!*5! AND 12C3*9C4 ARE ALSO WRONG.REMAINING OPTION IS ........12^12
• 12 years agoHelpfull: Yes(11) No(18)
• i think it was option B since we should pick one by one and he asked possible way only...
• 12 years agoHelpfull: Yes(3) No(2)
• 12! is correct ...possible sequence of 3,4 and 5 arranged in shelf
  one by one ...at every each choosen book one less book is available
  
  
• 10 years agoHelpfull: Yes(0) No(1)
• The correct answer is 12c3*9c4
• 9 years agoHelpfull: Yes(0) No(0)