If you followed along in the setup, it’s easy to see that D is CORRECT. If Y tests H on the first day, then S has to test H on the second day. That leaves no room for T to test H.
So Y can’t test H on the first day.
This diagram proves A and C could be true.
The diagram from question 14 proves that B and E could be true. R tests J on the second day and Y tests H on the second day.
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MemberGabrielle says
Where did the second diagram come from? It isn’t the answer for #13 or #14. In my work, #13 and #14 eliminate A, B, and E. I understand the reasoning behind the correct answer, but I’m wondering how you would tackle this in timed conditions
FounderGraeme Blake says
I made it up for the question for anyone who wasn’t sure about those answers. But the real way to do this quickly is in the first paragraph. This one flows from the setup.
>”If you followed along in the setup, it’s easy to see that D is CORRECT. If Y tests H on the first day, then S has to test H on the second day. That leaves no room for T to test H.”