1. Since c_{n} > L, there must be a relationship between the elements of c_{n} and the number L. State that relationship.
2. Now you need to show that the relationship stated in "1" indeed holds. To show this:
a. assume L = L1 + L2
b. use the given fact that the relationship stated in "1" holds between a_{n} and L1, as well as between b_{n} and L2, to show that when L = L1 + L2, the relationship in "1" holds between c_{n} and L.
