as 'get_posts()' uses the 'WP_Query()' parameters, i would assume that this should work:
$laargsM = array('cat' => 7,'posts_per_page' => 300,'orderby' => 'title','order' => 'asc','category__not_in' => array(10) );
as 'get_posts()' uses the 'WP_Query()' parameters, i would assume that this should work:
$laargsM = array('cat' => 7,'posts_per_page' => 300,'orderby' => 'title','order' => 'asc','category__not_in' => array(10) );