You are visiting a kennel that has three German Shepherds, four Labrador Retrievers, six Chihuahuas, five Poodles, and four West Highland Terriers. When you arrive, the dogs are taking a walk. What is the probability of seeing a German Shepherd first, then a Chihuahua?
total dogs ---- 22
prob(GS the C) = (3/22)(6/22) = ....
(there are still 22 dogs, just because you saw one of the German Sheps, does not remove that dog)