my $arrayref = [ 4200 / 100  ];
print "The answer is $arrayref \n";

##</code><code>##

 my $arrayref = [ 4200 / 100  ];
print "The answer is @$arrayref \n";

##</code><code>##

 my $arrayref = ;
print "The answer is @[ 4200 / 100  ] \n";

##</code><code>##

syntax error at - line 1, near "= ;"
Execution of - aborted due to compilation errors.
##</code><code>##

 
print "The answer is @{[ 4200 / 100  ]}\n";