I was playing Scrabble with a few friends last night and, as none of us have quite yet learned the ways of prob & stats, we were debating how to calculate the probability of this scenario: I had just formed a word and had to pull three letters out of a bag containing seven letters. One of the letters was surely a Z. What was my probability of pulling out that Z (which, by the way, I did)? As I've never covered any prob & stats in years (and even then it was covered in just one class day), I wasn't sure how to even begin this. Thanks in advance for helping solve this crucial problem!