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Re: ­For each of six archaeological excavation sites, the table shows whet [#permalink]
Expert Reply
 
chetan2u wrote:
­
All Data Insight question: Tables [ Official Guide DI Review 2023-24] 


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

SitePotteryJewelrySatuettes
Ayesyesno
Bnonoyes
Cyesnoyes
Dyesyesno
Enonoyes
Fyesyesno
(Sort ↕ the table by clicking on the headers)

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

­
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
GMAT Club Bot
Re: ­For each of six archaeological excavation sites, the table shows whet [#permalink]
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