题目:
How many different ways can 3 cubes be painted if each cube is painted one color and only the 3 colors red, blue, and green are available? (Order is not considered, for example, green, green, blue is considered the same as green, blue, green.)
选项:
A、A 2
B、B 3
C、C 9
D、D 10
E、E 27
答案:
D