Views pagination - show different number of items in different pages

1. Initilize the default items to page 3
2. in your custom module :

function hook_views_pre_build(&$view) {
    if ($view->name == "YOUR_VIEW_NAME" && !empty($_GET['page'])) {
       $view->init_pager();
       $view->set_items_per_page('10');
    }
}