1)Let . Define , and . Find the radius of convergence of .

The next two problems are for the younger kids, so give them a chance.

2)Let be a set (non-empty) of finite terms. A "partition" is breaking the set into two sets (non-empty) so that together they have the all the elements of but none of eachother. For example, let then are partitions. But are not. Say that has elements. How many different paritions are there in terms of ?

3)Given an checkerboard what is the maximum number of checkers which can be placed so that no two are adjacent.Proveyour answer. "Adjacent" means either horizontally or veritcally next to eachothernotdiagnolly.