中學數學問題，請幫忙

1. A committee of 3 teachers are to select the winner from among ten students nominated for special award. The teachers each make a list of their top three choices in order, the lists have only one name in common, and that name has a different rank on each list. in how many ways could the teachers have made their list?
2. In how many ways could a class of 18 students divide into groups of 3 students?
Urgent

Thanks in advance