Odd or Even.
To tell in which hand of a person, having an odd number in one hand and an even number in the other, the odd or even number is. Desire the person to multiply the number in his right hand by a figure which is an odd number, and the number in his left by an even one; and to say if the products added together are odd or even. If even, the even number is in the right hand; if odd, the even number is in the left hand.