The hobbyist could select any of the following plant combinations EXCEPT

Romans November 20, 2014

I don't get it why it is B

There is no requirement for choosing Y as long as G is not there. And for W, W can be there with an J. So B should be a possible combination. Where am I wrong in this process?

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Naz November 25, 2014

You can access the video explanation for this game by pressing the "play" button on the screen.

Hope that helps! Please let us know if you have any other questions.

Mia6 May 2, 2016

Still can't make sense of how we arrived to this answer? There are no restrictions to follow and the video doesn't explain how we arrived to the answer. Please help!!!!

Mehran May 2, 2016

@Mia6 we are able to eliminate (A), (C), (D) and (E) based off previous work but you can easily draw out a hypothetical that also proves (B) is not possible.

If both W and Y are selected for the plants, we know that X and Z are out.

Selecting Y means that G is not selected (rule 1).

We also know that if we do not have X, then we do not have K (rule 4).

If K is out, then we know that H is also out (rule 2), which leaves only two fish available, i.e. J and L, but we need to select 3 fish.

Hope this helps! Please let us know if you have any other questions.

Mia6 May 4, 2016

That helps a lot. Thanks!

marissa June 21, 2018

i don't understand what you mean by we only have 2 fish left (J&L) but we need to select 3, this is true but H is the third fish being selected? That doesn't make sense as to why it is wrong. If W and Y are paired with this pairing, which is also the fish from question 15, I don't see how it is not an acceptable pairing.

Christopher June 22, 2018

@marissa, H cannot be the third fish selected because H requires K which requires X, and if you have W and Y as the plants, there is no room for X. Put in contrapositive form: if you have W and Y, then you don't have X. If you don't have X, you can't have K. If you don't have K, you can't have H. Also, if you have Y, you can't have G, so you've eliminated fishes G, H, and K by having W and Y as the plants, and that's not a viable solution.

Does that help?

Tony March 14, 2019

Thanks Mehran, that was really helpful! That's the explanation that should be in the video for this question.

iggy.salas October 11, 2020

very helpful, thanks!