This should be a simpler one…..
You have two pill bottles, one marked Pill A, the other Pill B. You need to take exactly one each per day. If you take 2 of the B’s you will die. Okay, you shook one of the A pills into your hand, however when you were shaking out the B pill, 2 accidentally fell out. Now the pills look exactly alike, taste the same, are identical in markings. In other words, one cannot tell them apart. What are you to do, what with 3 pills of undetermined make-up in your hand? You cannot throw the 3 pills away because you need the take them all.