ODD OR EVEN.

Let one of the company take in each hand several cards, an even number in one hand, and an odd in the other.

You engage to tell in which hand he holds the even number.

To do so, bid him multiply the number held in his right hand by three, and that in his left hand by two, and add the product together. He is then to answer whether the sum is odd or even.

If even, the right hand contained an even number, and vice versâ.