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# GMAT Diagnostic Test Question 37

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Joined: 11 Oct 2013
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Re: GMAT Diagnostic Test Question 38 [#permalink]

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16 Dec 2013, 01:33
jallenmorris wrote:
I think this is the best approach. Especially when there are multiple situations that satisfy the question. In this question, it was simple, there are only 4 possble results RR, RG, GR, GG, and the only one that doesn't satisfy the solution is RR. So rather than finding the probability of RG, GR, and GG that DOES satisfy the "at least 1 green hat". If we find the situations that DO satisfy, meaning all 3 situations, then we have to add together their total probability. If we find the probability of the 1 situation we DO NOT want, all we have to do is subtract that probability from 1 and it's a much simpler problem. I would say much simpler than a 700 level question.

hrish88 wrote:
For me easiest way is 1-(RR)=1-6/11*5/10=8/11

yeap! have the same...
but would it change if i got green at 1st time (5/11)
and no green at 2nd time *(1-6/10) or *(1-3/5)----->5/11*2/5=2/11?
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Re: GMAT Diagnostic Test Question 38 [#permalink]

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16 Dec 2013, 01:37
3111987 wrote:
jallenmorris wrote:
I think this is the best approach. Especially when there are multiple situations that satisfy the question. In this question, it was simple, there are only 4 possble results RR, RG, GR, GG, and the only one that doesn't satisfy the solution is RR. So rather than finding the probability of RG, GR, and GG that DOES satisfy the "at least 1 green hat". If we find the situations that DO satisfy, meaning all 3 situations, then we have to add together their total probability. If we find the probability of the 1 situation we DO NOT want, all we have to do is subtract that probability from 1 and it's a much simpler problem. I would say much simpler than a 700 level question.

hrish88 wrote:
For me easiest way is 1-(RR)=1-6/11*5/10=8/11

yeap! have the same...
but would it change if i got green at 1st time (5/11)
and no green at 2nd time *(1-6/10) or *(1-3/5)----->5/11*2/5=2/11?

Can you please elaborate what you mean? Thank you.
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Re: GMAT Diagnostic Test Question 38   [#permalink] 16 Dec 2013, 01:37

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# GMAT Diagnostic Test Question 37

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