Addition Equals Multiplication

Here's a neat little math problem that involves nothing more than simple straight addition and multiplication. And we're only concerned with whole positive numbers.

Ready?

Find the only two numbers whose sum is equal to their product.

In math form, a + b = a x b.

Now, find the only three numbers whose sum equals their product.

a + b + c = a x b x c.

Finally, find the only four numbers that do the same thing.

You have 10 minutes to solve everything.

Go!