A.There are 10 different 3-person teams of experienced engineers she could send.
B.There are 3 different 2-person teams of apprentice engineers she could send.
C.There are 2 different 2-person teams of apprentice engineers she could send.
D.There are 10 different 2-person teams of experienced engineers she could send.
E.There are 10 different 4-person teams of experienced engineers she could send.
我的答案：
