Suppose a man has a cloning machine. It has two chambers A and B. Any person who wants to make a clone of himself/herself enters in chamber A. Then, the machine does one of these two things:
- Teleport the original person to chamber B and make their clone in chamber A.
- Make a clone of the person in chamber B and the original person remains in chamber A.
But no one knows what the machine does out of these two choices.
Suppose the man uses the machine. After the machine is done cloning, the only difference between the man and his clone is that the man existed before that moment and the clone didn't. But both of them remember using the machine. The clone actually never used the machine but he too has the same memories of using it.
Before the man used the machine, he is sure that he is the original and the other person who is about to be created would be the duplicate. After he is done using the machine, he again is sure that he is the original because he has the memories of using the machine and creating his clone. But if he gives it a little more thought he'd know that, for all he knows, he could be the clone and still be thinking that he is the original.
So, after someone makes a clone of themselves, would they really get confused whether they existed before that moment?