No need to loop. Set up the list with the appropriate numbers of 1s and 0s and then shuffle it. 

use List::Util qw[shuffle];
$m = 65; $n = 100;
@list = ( (1) x $m, (0) x ( $n - $m ) );
@list = shuffle @list;

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In reply to Re: random elements with fixed totals by BrowserUk
in thread random elements with fixed totals by ysth

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