The output you receive when running the code in question 1 depends on whether you have warnings turned on. Did any candidate mention that, was that part of the answer you were looking for? I'm just curious :-)

#!/usr/bin/perl -w

print (2 * 3) + 3;
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Results in:

print (...) interpreted as function at foo.pl line 3
Usless use of integer addition (+) in void context at foo.pl line3.
6
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Remove warnings and you just get 6

-- vek --