Learn some basic perl man!! 
@b = ( @a, 11, 32 );

my ( @newa, @newb, @newc );

my @sizes = ( scalar(@a), scalar(@b), scalar(@c) );

my @where_to = qw/a b c/;

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I'm still not sure what you're trying to do.. but you might want to checkout perldoc -q shuffle 
use List::Util 'shuffle';
@shuffled = shuffle(@list);

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UPDATE I believe the op just now clarified what about something like this, using parallel assignment: 
use XXX; 
use List::Util;
@a=qw/foo bar baz/;
@b=qw/mickey/;
@c=qw/x y z/;

(@a[0..$#a],@b[0..$#b],@c[0..$#c]) = List::Util::shuffle(@a,@b,@c);

XXX [\@a, \@b, \@c]'

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Evan Carroll
I hack for the ladies.
www.EvanCarroll.com

In reply to Re: Randomize elements among several arrays, while maintaining original array sizes. by EvanCarroll
in thread Randomize elements among several arrays, while maintaining original array sizes. by BioNrd

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