N-Tuple Exercise Solutions

1. The fourth component of
   (31, 28, 31, 30, 31, 30, 31,  31, 30, 31, 30, 31)

   is 30. (In the example from which this was generated, this means that there are 30 days in April, the fourth month of each year.)

2. 
   
   (1, 2, 3) - (4, 8, 2)=(-3,  -6, 1).