Amit has a RS 1,5 10 and 20 note in his wallet.how much ways are there for him to pull out 2 notes and have enough to pay Rs 8 for lunch?

• total number of note = 4
  total possible way of selecting 2 note = 4C2 * 2!= 4!/(2!*2!)*2=6*2=12
  (1,5) and (5,1) don't give total greater than or equal to 8.
  So , number of ways are= 12-2=10
  i.e (1,10)(1,20)(5,10)(5,20)(10,1)(10,5)(10,20)(20,1)(20,5)(20,10)
• 10 years agoHelpfull: Yes(3) No(1)