The hobbyist could select any of the following groups of fish for the aquarium EXCEPT

vladimir-prohoroff October 24, 2021

Question #9

I need a bit of clarification rule. Rule 1 states if G then no H/Y. If y is selected then we can't have H/G because that's contrapositive. So I guessed E as the correct answer because we are left with JKL

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Jay-Etter January 23, 2022

Your contrapositive here is correct.
We would write this rule as G(f) IN -> H(f) and Y(p) OUT
Contrapositive: H(f) or Y(p) IN -> G(f) OUT.

However, E isn't the correct answer here because the question is asking us which couldn't work as the group of fish. With E, we could have
IN:J(f) K(f) L(f) W(p) X(p)
OUT: G(f) H(f) Y(p) Z(p)
This game works and doesn't violate any of the rules, so E does work and we can therefore eliminate it.