A certain office supply store stocks 2 sizes of self-stick notepads,
each in 4 colors: blue, green, yellow, or pink.
The stock 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?
Ans:16
請問思路要怎麼走? thx~
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