> Theoretically, either/or I'm assuming. If A isn't 10 or A isn't 9...
But since A cannot be both 9 and 10 at the same time, A will *always* not
be one of them.
It's exactly the same as saying: if (!(A==9 AND A==10))
Obviously A cannot be both 9 and 10 at the same time so the above will be:
if(!(false)) which is the same as if(true)
Some people find it helpful to draw Venn diagrams of their boolean logical
expressions. See http://www.lib.csub.edu/infocomp/search/boolean/venn.htm
for a simple description of those.
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