lordw wrote:

Hi guys, I made a gmat prep yesterday and score more than 700. I need help with the following problem:

"A certain office supply store stocks 2 sizes of self stick notepads, each in 4 colors, blue, green, yelow or pink. The store packs the notepad in packages that contain either 3 notepads of the same size and of 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?"

A) 6 B) 8 C) 16 D) 24 E)32

B G Y P -- Size 1

b g y p -- Size 2

For Size -1:

No . of ways 3 notepads of the same size and of the same color = 4 (BBB,GGG, YYY, PPP)

No . of ways 3 notepads of the same size and of 3 different colors= 4C3 (BGY,PGY, YPB, BPG)

For size -1 = 4+4C3 = 8

similarly For size -2 = 4+4C3 = 8

Total =16

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