prep里一数学题PS（不明白）请大家教教我~~~

gracezz

An automobile manufacturer offers a station wagon with either a 6-cylinder engine or a 4-cylinder engine and with either a manual transmission or an automatic transmission. A trailer hitch is also offered, but only on a station wagon with a 6-cylinder engine. How many combinations of the five options listed does the manufacturer offer for its station wagon?

(A) 3
(B) 4
(C) 5
(D) 6
(E) 8

答案D
答案D

gracezz

这题可以自己就理解成可以是四个组合也可以是两个组合吗？

why不why

答案是6种么？

gracezz

是六种！！楼上咋解滴？是理解成可能取两种，可能取四种吗？

why不why

An automobile manufacturer offers a station wagon with either a 6-cylinder engine or a 4-cylinder engine and with either a manual transmission or an automatic transmission. A trailer hitch is also offered, but only on a station wagon with a 6-cylinder engine. How many combinations of the five options listed does the manufacturer offer for its station wagon?
1.a station wagon with 6             2
2. a station wagon with 4            2
3. a trailer hitch on a station wagon with 6      2
2 refers to a manual transmission or an automatic transmission

2+2+2=6

gracezz

题里没说的时候就是把所有的组合全算进来是吗？
我可以有这个assumption吗？