Remember that one of 5 or 6 always has to be in the middle. See the setup for the explanation of this deduction.
In this question, only one dish is stored in the middle. So it has to be 5 or 6.
2 has to be above 6. 2 can’t go in the middle on this question, so 2 has to go in the top group:
1 and 4 have to be split between the two other groups:
The question asks for two dishes that could be the only ones on the top shelf. We know that 2, and one of either 1 or 4 has to be on top.
A is CORRECT.
Practice Exercise – Fill out the Scenarios
You could draw a few scenarios on this question, but it’s not necessary. We already have enough information to answer the question, and it would be a lot of drawing to fill in the full placements for 6/5 and 3.
But, as a practice exercise, you might find it useful to draw the possibilities. They are:
- 6 middle, 5 is on the bottom or top.
- 6 bottom, 5 middle.
3 can go on the bottom or the top. Unless 5 is on top, then 3 has to go on the bottom, because shelves can have max three dishes (rule 1).
If you’re not sure why these restrictions exist, draw these scenarios for practice, while referring to the rules.
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