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Is it E?
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But the statement says the librarian picks up 100 of the books returned , that means there are more than 100 books were returned ..and it could be that not all the 15 books were counted in the 100 picked
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Quote:

You're right. But we are looking at sufficiency. The question is Are fewer than 20% of the books the librarian picks up on history?
Fewer than 20% of 100 means 0-20 which means any number within that range can be the answer.
The second option II stated the time frame (3 weeks) and also gave a figure of exactly 15 books (which is fewer than 20% of 100) making it more than sufficient to answer the question asked
Yea but we cannot for sure say that all the 15 books were picked up as it’s mentioned that more than 100 books were returned on that day and the librarian arbitrarily picks up 100 from them and it might happen that all the 15 books were not included in the 100 so we don’t know the favourable outcome though we have total outcome which is 100 and hence statement 2 according to me is also not sufficient

I don’t have the solution set to these questions yet hence have to find it out myself
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Quote:

even if more than 100 books were picked, the history books remained 15, so percentage will remain less than 20
Good point ..yea thanks
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Need Advice: I have completed OG quant questions. What should I practice next? Would moving to GMATClub question reinforce the concepts and enable more practice? Any suggestions would be helpful.
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Good suggestion, thanks for sharing
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Hi, anyone having contact details of trishala punjabi verbal faculty
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Anyone preparing from Gurgaon? And looking for a study partner?
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Anyone preparing from Kolkata ? And looking for a study partner?
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