Puzzle #7: Double Jeopardy Doors

By Muriel Bristol (Transcriber) | October 9, 2018

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don’t know which is which.

There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.

You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don’t know which is which.

What is the question you ask?


[Answer to Puzzle #7 to follow in the next Puzzle]


Solution to Puzzle #6: Mislabeled Boxes

You know that the box labeled “Oranges and Apples” is labeled incorrectly. Therefore, it must contain either only apples or only oranges. Pick from that box.

Path One: If you pick an apple, relabel that box “Apples.” The box mislabeled “Oranges” must actually contain the apples and oranges. Relabel it “Oranges and Apples.” Finally, by process of elimination, the remaining box that is mislabeled “Apples” must actually contain oranges. Relabel it “Oranges.”

Path Two: If you pick an orange, relabel that box “Oranges.” The box mislabeled “Apples” must actually contain the apples and oranges. Relabel it “Oranges and Apples.” Finally, by process of elimination, the remaining box that is mislabeled “Oranges” must actually contain apples. Relabel it “Apples.”

Apple Computer used this question in interviews for the position of Software Quality Assurance Engineer.

Congratulations to Mike Sylvia for solving this first, with a Path One solution. He gets the glory, such as it is. Those who followed after him are entitled also to a measure of thanks for their effort and satisfaction in their results.

Author: Muriel Bristol

"Lady drinking tea"

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