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by cramya » Thu Sep 18, 2008 2:09 pm
Refer to https://www.beatthegmat.com/gmatprep-prob-t18635.html
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by stop@800 » Thu Sep 18, 2008 10:51 pm
option A:
Same size same color
total ways = 4*2 =8

Option B:
Same size, diff color
for one size, 3 colors can be selected in 4 ways [any one can be left]
so total 4*2 ways

Total = 8 + 4*2 = 16
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