PrepTest 69, Section 1, Question 10
Exactly six petri dishes�labeled dish 1 through dish 6�are to be stored in an otherwise empty refrigerator. There are three available shelves�the bottom shelf, the middle shelf, and the top shelf. The placement of the dishes must be consistent with the following conditions:
Exactly six petri dishes�labeled dish 1 through dish 6�are to be stored in an otherwise empty refrigerator. There are three available shelves�the bottom shelf, the middle shelf, and the top shelf. The placement of the dishes must be consistent with the following conditions:
Exactly six petri dishes�labeled dish 1 through dish 6�are to be stored in an otherwise empty refrigerator. There are three available shelves�the bottom shelf, the middle shelf, and the top shelf. The placement of the dishes must be consistent with the following conditions:
Exactly six petri dishes�labeled dish 1 through dish 6�are to be stored in an otherwise empty refrigerator. There are three available shelves�the bottom shelf, the middle shelf, and the top shelf. The placement of the dishes must be consistent with the following conditions:
No more than three dishes are stored on any shelf.
Dish 2 is stored at least one shelf above dish 6.
Dish 6 is stored either one shelf above or one shelf below dish 5.
Dish 1 is not stored on the same shelf as dish 4.
If dish 5 is the only dish stored on the bottom shelf and if exactly two of the dishes are stored on the middle shelf, then which one of the following is a pair of dishes that must be among the dishes stored on the top shelf?
dish 1 and dish 2
dish 1 and dish 6
dish 2 and dish 3
dish 2 and dish 4
dish 3 and dish 4
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