GMAT Critical Reasoning (CR) | Some members of the basketball team are members of the chess club

Abhishek009 : Thank you for response.

I see that Case 2 infact tells me that option (E) is not correct. From Case 2 Venn, it is clear that some of the members of chess club are members of debate society (some part of black overlaps with green)

And if I am not mistaken E is the answer. Why are you trying to disprove it?

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