9.一个队有4个team,同另一个队6个team discuss,one team at most once.问有几次discussion.
10.有一数列,形如: a4=a1 a2 a3 已知an=p, 求a(n 2) = ?
11.问 x/6 是 integer? 1: x是integer 2: 6x shi integer
12. 某人有bookcase, arrange 10 books per shelf and no books left. If he acquired 10 additional books, and arrange 12 books per shelf, no books left. Ask how many books he has before acquiring the addition 10 books 1) before acquiring, his books less than 96 2) before acquiring, his books more than 24