here's a problem I'm trying to help my 7th grade daughter with and I

just cant remember how to solve it...

"You are given 5 different weights, marked 1lb, 2lb, 5lb, 6lb, and

10lb. How many different weights can you obtain using these weights?"

My first thought was to do something with 5!, but that doesn't address

the need to get unique combinations.

I've tried searching in a number of different ways to find similar

problems, but can't find anything. Seems like it should be a simple

answer.

Can anyone help?