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Q30

by magical cook » Tue Sep 25, 2007 6:16 pm
I'm sorry the figure is corrupt but it shows as it is on my paper.... but hopefully someone could still help me...
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30.JPG
30.JPG
Last edited by magical cook on Wed Sep 26, 2007 7:35 am, edited 1 time in total.
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by kajcha » Tue Sep 25, 2007 6:27 pm
IMO 12

Suppose there are x cards in the stack.

Probability of both cards to be blue = (9/x)*(8/(x-1)) = 6/11

Solving the above eq

x(x-1)=12*11

x=12 ANS
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by magical cook » Wed Sep 26, 2007 7:36 am
Kajcha, sorry...I attached a wrong file first (yes OA is correct) but can you also take a look at the above file as well? Thanks for your help..
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by kajcha » Wed Sep 26, 2007 7:45 am
The attachment is not very clear. I am having difficulty to figure the pic out. Is it possible for you to draw a pic using some other s/w and attach that?
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by magical cook » Wed Sep 26, 2007 8:00 am
Actually, original attachment looks as it is on my paper.... :cry:
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