It’s one of those phrases I just kinda nod my head and go “yeah” when I hear it. I’ve looked it up before, but the definition never stuck. Same thing happened with “survivorship bias,” but I eventually figured that one out.
I guess I need it explained in a different way for it to stick.
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“Mutually exclusive” means than picking either A or B will *exclude* the other one.
“Save the last slice of pizza for later” and “eat the last slice of pizza now” are mutually exclusive. If you save it for later, than you *can’t* eat it now. If you eat it now, then you *can’t* save it for later. Picking either option *excludes* the other.
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