As LSW say, choice is our what we want to do with external, internal and inline style sheets. But can I know what you want to explain by following :
"10 repeated inline styles per page, 10 pages, 1000 repeat styles.
Internal CSS, same style once per page, 10 repeat styles.
1 style defined in a external style sheet... 1 style for all 10 pages and all 1000 lines."