Hey Mike,

The OA here is different from the one posted on the Magoosh link. I got 90, which is the OA here, but the site says 180.
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Dear aviram,
My friend, be careful. On the Magoosh site, there are two questions, #8 and #9, that superficially look identical, but there's a subtle different makes the answers different. The question posted here in this GC thread is #9, which indeed has the OA you calculated, but when you looked at the Magoosh website, I believe you looked at the OA of #8.
You never can read too carefully on the GMAT Quant section. Does all this make sense?
Mike
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Whatever you say makes sense to me dear Mike
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I tried this:

3 Blue Marble:

Different distribution : (1) All 3 in the same cup (2) Split 2-1 in two cups (3) Split 1-1-1

Case (1) 3 possibilities
Case (2) 6 possibilities ,
Case (3) 1 possibility

tot. 10 possibilities.

One Green Marble :

3 possibilities (one for each cup at the time)

First Red marble:

3 possibilities (one for each cup at the time)

Second Red marble:

2 possibilities ( because can't go in the same cup with the other Red marble)

TOTAL:

10*3*3*2 = 180 , answer, B .

Let me know if my conclusion is correct. thanks!

blue --> 3,0,0 ==> 3!/2! ; 2,1,0 ==> 3! ; 1,1,1 ==> 3!/3!
total = (3+6+1) = 10

red --> 1,1,0 ==> 3!/2! = 3

green --> 1,0,0 = 3!/2! = 3

answer = 10*3*3 = 90.
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