error en “is_paged() ?

i want to show cat=3 in page=7. i write this:

<?php
if (is_paged==’7′) {
query_posts(‘cat=3&showposts=1’);
}
?>

but it don`t go….

as well i write this:

<?php
if (is_page(‘7’)) {
query_posts(‘cat=3&showposts=1’);
}
?>

but not…..