how can you use excel to solve this?

The Lego Problem. Lego sells individual minifigures in opaque packages, so you don't know which one you are buying. In the current series there are 16 different minifigures available. I already own several minifigures and really only want to get 2 specific ones. If my son and I go shopping (and don't want to spend half an hour feeling up each and every package), what is the minimum number of packages we should buy to have at least a 60% chance of getting at least 1 of the 2 figures we want? (Assume that each store has a large number of packages which contain a random and even distribution of all the 16 possible minifigures.)