Originally posted by Dale Hoyt:
Where A can = 1, 2, 3, ..., 9
Precisely. But as to "Enough said?", there are two sorts of people - those who have a reasonable grasp of basic maths, and those who don't.
And the first lot will have reasoned it for themselves without your explanation, and the second lot won't understand your explanation. At least, it would need to be fleshed out a lot for maths laypersons (as I've found). So it isn't enough said.
(That isn't meant to be a criticism of your succinct explanation.)
PS - Perhaps I should have said that there are 10 kinds of people in the world - those who understand binary, and those who don't.