How to display posts from multiple post type in random order in wordpress?

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You would need two queries to achieve this. You can’t specify the limit per post type in WP_Query (without modifying the raw SQL). What you could do is simply query the posts and the photos and merge the resulting arrays:

// Fetch posts
$posts_query = new WP_Query( array(
    'post_type'=> 'post',
    'orderby' => 'date',
    'posts_per_page' => 10,
    'paged' => get_query_var( 'paged' )
) );

// Fetch photos
$photos_query = new WP_Query( array(
    'post_type'=> 'photo',
    'orderby' => 'date',
    'posts_per_page' => 10,
    'paged' => get_query_var( 'paged' )
) );

// List of merged photos and posts
$mergedposts = array();

for ( $i = 0; $i < 10; $i++ ) {
    // Add post to list
    if ( isset( $posts_query->posts[ $i ] ) ) {
        $mergedposts[] = $posts_query->posts[ $i ];
    }

    // Add photo to list
    if ( isset( $photos_query->posts[ $i ] ) ) {
        $mergedposts[] = $photos_query->posts[ $i ];
    }
}

Then, you should set up the post data using setup_postdata (as you can’t use the_post outside of the query scope).

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