- #1

- 986

- 9

These all seem straight-forward to me. Or there's something I'm not understanding about them.

For instance, problem 1:

Is there supposed to be some fancy way of doing that?If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Find the sum of all the multiples of 3 or 5 below 1000.