Rule substitution questions are easier than they seem. There are not many ways the testmakers can create the same effect with a new rule.
Usually, the testmakers will use the secondary effects of a rule. For instance, in this case, rule 1 says that FH are together. So when rule 4 forces H to go into T, really it means that FH must go to T.
This means that you can duplicate the rule’s effect by referring to F instead of H. Only C mentions F.
If you look closely, the effect is the same. Instead of forcing H and M into T, K forces F and M into T if K isn’t assigned to T. Because F and H go together, this new rule forces H into T as well. C is CORRECT.
All of the wrong answers make one of these two mistakes:
- They allow things that aren’t normally allowed.
- They ban things that aren’t normally banned.
Some of the wrong answers are true according to the normal rules. But you’re not looking for what’s true. You’re looking for something to replace the effect of the missing rule.
A is wrong because it allows one of H or M to be assigned to S with K. Normally this can’t happen.
B is wrong because it doesn’t say where F, H and M must go.
D is wrong because it doesn’t force M to be assigned to T if K isn’t assigned to T.
E is wrong because it should have said “unless both H and M are assigned….”
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