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Q.18 - The correct answer choice is A - RSRT. Rule # 3 says every R has atleast 1 T adjacent to it. In order for this to be correct, the S in this answer choice should be a T. Therefore, the only correct choice I can see is E - TSRT. Can you please confirm?
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Okay just trying the set up from the start.
So we have houses 1, 3, 5, 7
Across from houses 2, 4, 6, 8
There's 3 types of houses. r, s, and t.
Adjacent houses (13, 35, 57; 24, 46, 48) cannot be the same type.
Opposite houses (12, 3,4, 56, 78) cannot be both s.
If a house is a 'r' type than at least one house next to it will be a t (any corner r has a t next to it).
3 = r
6 = s
5 cannot be a s (6 across from it is a s). 5 cannot be a r (3 next to it is a r). Therefore:
5 = t
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Okay so last question takes away 6 = s, which therefore takes away 5 = t so we can only go through options one by one.
a - impossible, r with no t next to it.
b - possible, the few restrictions in place allow this.
c - possible
Ah I'm an idiot it's a simple misreading. You're correct in saying A is impossible. But the question is asking what can't be true, not what can be true. So A is right because it's wrong.