這條GRE的題，誰懂得做?

來源: 於 2014-11-15 12:36:58 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

Sandy has a husband and 2 children. She brings at
least 1 member of her family to a diner for lunch
every day. The diner offers 10 lunch specials. If no
one orders the same thing, how many different orders
can Sandy’s family make for lunch?
Indicate all possible values.

答案選項分別是45，90，120，210，720, 5040