Suppose we have a 500- piece puzzle, in which there are 100 edge pieces and 50 pieces that belong to another puzzle mixed in (this is not too far- fetched since in my house my 5-year-old likes to mix things up on me).

You pick 2 puzzle pieces (sequentially) on your first draw.

Assuming the first piece you picked is not replaced, what is the probability that you would pick an edge piece?