For each of six archaeological excavation sites, the table shows whet

Question

For each of six archaeological excavation sites, the table shows whether pottery, jewelry, or statuettes were found at that site.

Site    Pottery    Jewelry    Satuettes     A  yes  yes  no    B  no  no  yes    C  yes  no  yes    D  yes  yes  no    E  no  no  yes    F  yes  yes  no

For each of the following statements about the sites in the table, select  Yes  if the statement is accurate based on the information provided. Otherwise, select  No .

ID: 700276

chetan2u · Accepted Answer

1. Jewelry was found only at sites where statuettes were not found. 
Sort the table as per 'Jewelery'.
Check if every site that had  yes for Jewelery  had a  no for statuettes .
 A, D and F have a yes for jewelery and each of them has a no for statuettes.
So, YES

2. Jewelry was found only at sites where pottery was also found. 
Sort the table as per 'Jewelery' again.
Check if every site that had  yes for Jewelery  had a yes  for pottery .
 A, D and F have a yes for jewelery and each of them has a yes for pottery. 
 So, YES
 Does not matter that C has a yes for pottery but a no for jewelery, because we are concerned with only the opposite, that is there should be no site of jewelery where pottery was not found.

3. Statuettes were found at each site where pottery was not found. 
Sort the table as per 'Pottery'.
Check if every site that had no  for pottery  had a yes  for satuettes .
 B and E have a no for pottery and each of them has a yes for satuettes. 
 So, YES 
  Does not matter what happens at sites where pottery was found. We are concerned only with sites that did not have pottery, and those are B and E.

https://www.youtube.com/watch?v=2jx5reGbvR4

KarishmaB · Answer

Video discussion on this question: https://youtu.be/OyN_szEDEPw The question is fairly tricky but can be simplified by using the concept of necessary and sufficient conditions. Keep in mind that much of non-Math logic that we talk about is based on necessary and sufficient conditions. Jewelry was found only at sites where statuettes were not found. "Only" indicates necessary conditions. 'Statuettes "no" is necessary for Jewelery "yes"' Check everywhere where you have "yes" for jewellery. Do you have "no" for Statuettes there? Yes you do. ANSWER: YES Jewelry was found only at sites where pottery was also found. "Only" indicates necessary conditions. Pottery "yes" is necessary for Jewellery "yes" Check everywhere where you have "yes" for jewellery. Do you have "yes" for Pottery there? Yes you do. ANSWER: YES Statuettes were found at each site where pottery was not found. Each/Every/Whenever/All indicate sufficient conditions. If pottery was "no", statuettes were "yes" Check everywhere where pottery was "no". Are statuettes "yes"? Yes they are. ANSWER: YES Check discussions on necessary and sufficient conditions here: https://youtu.be/MmlwcTlHZz8 https://youtu.be/BW8Ijrhjjq8 https://youtu.be/yQYkL1DSslA

GMATinsight · Answer

A simple question to answer where the candidate needs to be calm and patient.

Step-1: Read the information carefully above to table to grasp the nature of data given

Step-2: Read the first line to be validated as Yes or NO carefully to know where the sorting needs to be applied.

I)The first line is  "Jewelry was found  only  at sites where statuettes were not found." 
so I sorted it as per 'Jewellery' and I see the following table

https://gmatclub.com/forum/download/file.php?mode=view&id=75439

I can see wherever jewellery is found, statuettes were not found hence this statement is a  YES

II) The second line is  "Jewelry was found  only  at sites where pottery was also found."

I can see wherever jewellery is found, statuettes were not found hence this statement is a  YES

III) The third line is  "Statuettes were found at  each site  where pottery was not found." 
Now arrange table as per pottery and we see the following table

https://gmatclub.com/forum/download/file.php?mode=view&id=75440

as per this table, we can see that first two rows where pottery wasn't found, statuettes were found hence this statement is a  YES

Answer: Yes, Yes, Yes

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Gemmie · Answer

Jewelry was found only at sites where statuettes were not found => Yes

=> Everywhere Jewelry were found, statutettes were not found
=> Correct

Jewelry was found only at sites where pottery was also found. => Yes

=> Everywhere Jewelry were found, pottery were found
=> Correct

Statuettes were found at each site where pottery was not found. => Yes

=> Everywhere Pottery were not found, Statutettes were found
=> Correct

satish_sahoo · Answer

Hi  Bunuel ,

Can we have links to similar necessary and sufficient conditional questions? These are tricky, more similar questions for practice would be of great help.

Thanks.

PeachSnapple1 · Answer

You know it's an OG question when you thought to yourself "wait, why is it so easy. Am I missing something?" And surely after, you found out that you did... I got tripped over by the last one, I swear I saw the word   in that last statement when doing this, but now I can't find it...

PeachSnapple1 · Answer

I've been thinking of some similar statements to help myself with these kind of questions. Write here for my own sake so I could go back in the future if needed. If anyone spot a mistake, feel free to correct me. 
There are three identical to those in the statements.

1. Jewelry was found only at sites where statuettes were not found. --> True
2. Jewelry was found at sites where statuettes were not found. --> True
3. Statuettes was found only at sites where jewelry were not found. --> True
4. Jewelry was found only at sites where pottery was also found. --> True
5. Jewelry was found at all sites where pottery was also found. --> False
6. Statuettes were found at each site where pottery was not found --> True
7. Statuettes were found only at sites where pottery was not found. --> False

So basically, there are three main conditional statement relationships that are common in the GMAT:
1. If A, then B = B if A = If (not B), then (not A)
2. Only if A, then B = B only if A = If (not A), then (not B) = If B, then A
3. A unless B = If (not A), then B = If (not B), then A

My head hurts after writing all of this...

licrolicro · Answer

This is testing English grammar rather than testing table understanding.

PeachSnapple1 · Answer

I disagree. Maybe the Classic GMAT used to test on the grammar in the Sentence Correction (but only in the easy-level questions though). The sentence correction in the past and the whole GMAT focuses heavily on the meaning.

For each of six archaeological excavation sites, the table shows whet

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For each of six archaeological excavation sites, the table shows whet