Among nine presidential candidates at a debate, three are republicans and six are democrats.(a) in how many different ways can the nine candidates be lined up? (b) how many lineups by party are possible if each candidate is labeled either r or d? (c) for each of the nine candidates, you are to decide whether the candidate did a good job or a poor job; that is, give each of the nine candidates a grade of g or p. how many different "score cards" are possible?