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GMAT Prep Test - Probability Question

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Re: GMAT Prep Test - Probability Question

by ashishjha100 » Sun Sep 07, 2008 9:04 am
sameeranpanda wrote:Cud someone, plz help me out with this?

I'm not sure about my reasoning.....pls correct me if i'm wrong...... :evil:

Since it is a True/False question , a person can have 2 choices per question . so the total no: of ways to answer n questions will be 2^n


the no: of ways by which all are correct will be --> 1 way

so (1/2^n) < (1/1000)

ie. 2^n > 1000

the min value of n to satisfy the above inequality is n=10 :idea:
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