I know this one! I'm guessing we get extra points or something for a good explanation, right? So! First you separate the coins into two groups of six.
1 1 1 1 1 1 2 2 2 2 2 2
Those are the two sets. Weigh 1 1 1 against the other 1 1 1. If the scale tips in either direction, you know the fake coin is one of those six. And that means that the coins in the other set are all normal -- that's your control group.
no subject
1 1 1 1 1 1
2 2 2 2 2 2
Those are the two sets. Weigh 1 1 1 against the other 1 1 1. If the scale tips in either direction, you know the fake coin is one of those six. And that means that the coins in the other set are all normal -- that's your control group.
Are you getting this so far, Ty Lee?