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D01-23

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Re: D01-23 [#permalink]

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New post 12 Jun 2017, 06:49
lo123 wrote:
I think this is a poor-quality question and I don't agree with the explanation. In the second statement, the median can be 1/2 so we can say it is less than1/5 and the median can also be 1/5 then it is not less than 1/5. so we can't be sure.


Please re-read the solution carefully.

The question asks: is the median of the set less than 1/5?

From (2) the median could be 1/2, 1/5 or (1/5+1/2)/2=7/20. None of the possible values is less than 1/5. So, we have a NO answer to the question. Sufficient.

P.S. HOW is 1/2 LESS than 1/5?
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Re: D01-23 [#permalink]

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I think this is a poor-quality question and I don't agree with the explanation. For GMAT or OTHERWISE, a SET never has any repetitions. You should have mentioned a LIST instead of a SET in this question.
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New post 20 Aug 2017, 10:57
Indeed a high quality question that tests our skills of understanding prime numbers , reciprocals and divisibility.

Though I am not qualified enough to pass any comment or remark on any question, but one thing I am sure is that almost all the questions of Bunuel are truly excellent...

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New post 21 Aug 2017, 03:43
sharmapallavi wrote:
I think this is a poor-quality question and I don't agree with the explanation. For GMAT or OTHERWISE, a SET never has any repetitions. You should have mentioned a LIST instead of a SET in this question.


Yes, you are right. Edited as suggested. Thank you.
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Re: D01-23 [#permalink]

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New post 10 Nov 2017, 14:50
I can certainly see the logic in the explanation with this question, but I answered E. My basis for E is that all the terms could be 1/5 in which case the median is 1/5. My understanding of the wording of the question is the median has to be less than 1/5 to give a hard yes, but if you can have 1/5 as well as 1/2 and 7/20 as answers for #2, there is no clear yes or no. Am I overlooking something on this one?
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New post 11 Nov 2017, 01:28
zflodeen wrote:
I can certainly see the logic in the explanation with this question, but I answered E. My basis for E is that all the terms could be 1/5 in which case the median is 1/5. My understanding of the wording of the question is the median has to be less than 1/5 to give a hard yes, but if you can have 1/5 as well as 1/2 and 7/20 as answers for #2, there is no clear yes or no. Am I overlooking something on this one?


In a Yes/No Data Sufficiency questions, statement(s) is sufficient if the answer is “always yes” or “always no” while a statement(s) is insufficient if the answer is "sometimes yes" and "sometimes no".

The question asks: is the median of the list less than 1/5?

From (2) the median could be 1/2, 1/5 or 7/20. None of the possible values is less than 1/5. So, we have a definite NO answer to the question for all three possible values of the median. Sufficient.

Hope it's clear.
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Re: D01-23 [#permalink]

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New post 11 Nov 2017, 10:12
Thank you Bunuel! That helps to clear up my thinking. I had a lapse in my brain and forgot that 1/2 is greater than 1/5. Thanks again!
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Re: D01-23 [#permalink]

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New post 10 Apr 2018, 12:19
Hello Bunuel -

As per choice B - "The product of any two term of the list is terminating decimal".
now the list is of 10 numbers and consists of 1/2 and 1/5. So any two term can be 1/2 and 1/2 also right ???. I was confused about this while answering.
Shouldn't the choice be - "The product of any two distinct term of the list is terminating decimal".

Kindly explain so that I can clear my concept.
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New post 10 Apr 2018, 12:38
madhukaramar wrote:
Hello Bunuel -

As per choice B - "The product of any two term of the list is terminating decimal".
now the list is of 10 numbers and consists of 1/2 and 1/5. So any two term can be 1/2 and 1/2 also right ???. I was confused about this while answering.
Shouldn't the choice be - "The product of any two distinct term of the list is terminating decimal".

Kindly explain so that I can clear my concept.


Why were you confused? Yes, the two terms could be 1/2 and 1/2. Why not? 1/2*1/2 = 1/4 = terminating decimal.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: D01-23 [#permalink]

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New post 10 Apr 2018, 13:36
My Bad - to get a terminating decimal - the denominator needs to be in the form of 2(power -n) * 5 (power - n) . N can always be 0 as well. Time pressure - I am sorry.
Re: D01-23   [#permalink] 10 Apr 2018, 13:36

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