



 
Hi Carl. Here's how to do this with pencil and paper.
Here's another example: How many combinations are there for picking three numbers (no duplicates) from 1 to 20?
I didn't use any algebra, but if you want to step up to that, you will find easy formulas using factorials that give you quick answers. You can search for "combinations" in our Quick Search for more info on that. Hope this helps,  


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