If you couldn't count, you could still figure out that both of your hands had the same number of fingers by matching each with a corresponding finger on the oth

If you couldn't count, you could still figure out that both of your hands had the same number of fingers by matching each with a corresponding finger on the other hand. In other words there exists a bijection between the set of fingers on your right hand and the set of fingers on your left hand. Same reasoning can be applied to arbitrary sets, including infinite ones.