We recently saw a Maths Puzzle: "Which three numbers have the same answer when they are added together or multiplied together?"
The, reasonably straightforward, answer is One, Two and Three - 1 + 2 + 3 = 6 and 1 x 2 x 3 = 6.
Or is this the only answer?
Well, it appears to be the only answer if we are restricted to positive numbers, but what if we can use negative numbers?
0 + 1 + (-1) = 0 and 0 x 1 x (-1) = 0
In fact this works with zero, x and -x, whatever the value of x, so there are an infinite number of answers.