I purchased 3 pens from a shop.I want to gift 5 pens to my sister in an order out of which i want to give 2 pens from those i purchased such that they occur as prefix in the order.
find how many combination of pen can i give..???

• 3!*2!
  we consider the 2 pens as one group and arranged in 2! ways first,remaining three arranged in 3! ways
• 11 years agoHelpfull: Yes(14) No(2)
• as two pen are fix as prefix so no of combination is 4!
• 11 years agoHelpfull: Yes(11) No(1)
• 3
  As we have to give in prefix we have 2 positions which is 3C2
• 11 years agoHelpfull: Yes(9) No(12)
• d ans il b 3p2*3!
  v cant tk 4! bcz dere il b an outcm f purchasd pen 2 cm at last n as mentiond in d questn dat it shud occur as prefix..
  so 3! to rotate other pens and 3p2 to chose pen frm those purchased v have used permultation here cz its a matter f arrangment here
• 11 years agoHelpfull: Yes(3) No(0)
• 3*2=6
  ways to order prefix 2 pens and 3! to arrange remaining 3 pens
  so total no. of ways = 6+ 3!
  =12.
• 11 years agoHelpfull: Yes(2) No(2)
• 3!*2!=12.
  3! because the first 2 positions are fixed and the remaining positions can be arranged in 3! ways.
  2! because the 1st two positions with the new pen can be arranged in 2! ways.
  Therefore 2!*3!
• 11 years agoHelpfull: Yes(1) No(0)
• 3C2*4!=3*24=72
• 11 years agoHelpfull: Yes(0) No(1)