There are 6 bags of toys labeled A to F available to you and a friend.Each bag contains between 1 and9 toys, inclusive and each bag contains a unique number of toys. Show if you can grab two non-empty sets of unique bags such that you and your friend will have the same number of toys. E.g. bag A has 6 toys bag B has 5 toys bag C has 4 toys bag D has 4 toys bag E has 8 toys bag F has 1 toys. If you get D and F and your friend get B, you both have 5 toys.