请教PS FROM PREP

a certain office supply store stocks 2 sizes of self-stick notepads, each in 4 colors: blue, green, yellow, or pink, the store packs the notepads in packages that contain either 3 notepads of the same size and the same color or 3 notepads of the same size and of 3 different colors. If the order in which the colors are packed is not considered, how many different packages of the types described above are possible

6

8

16

24

32

16

(C3/4+4)*2

C3/4是同一size3种不同颜色的情况

4是同一size3种相同颜色的情况

2是2个size

4是同一size3种相同颜色的情况?? 能再详细解释一下吗? 不懂? 谢谢!

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B.  四个颜色选3个 (C3-1) 乘以2个size选一个   è8种组合

总共 8+8=16种组合  è答案
                C

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