GMAT数学一道求解A certain club has 20 members. What is the ratio of the member of 5-member committees that can be formed from the members of the club to the number of 4-member committees that can be formed from the members of the club?A.16 to 1B.15 to 1C.16 to 5D.15 to 6E.5 to 4貌似我连题都没看懂?这题不是说把这20人分成5人一组和20人分成4人一组可以形成组数的比率是多少么?