bash test -n && test -z return tru

[Poor Yorick]

from reading the bash man pages, I would have thought the -n and -z were 
mutually exclusive.  Therefore I don't understand this result:

~>$ [ -n $(which nonexisingfilename 2>/dev/null) ] && [ -z $(which 
nonexistingfilename 2&>/dev/null) ]  && echo hello
hello
~>$

can anyone help explain this?

--
Poor Yorick


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