https://foxoyo.com/mcq/9362/a-selection-is-to-be-made-for-one-post-of-principal-and-two-posts-of-vice-principal-amongst-the-six-candidates-called-for-the-interview-only-two-are-eligible-for-the-post-of-principal-while-they-all-are-eligible-for-the-post-of-vice-principal-the-number-of-possible-combinations-of-selectees-is