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Microsoft Software Development Engineer I Interview Question (student candidate)

"Very simple question: There are 9 jars. 8 jars contain marbles which each marble weights 1 gram, and 1 jar contains marbles weight 1.1 gram. With a scale display number, how can define which jar contain 1.1 gram marble with only 1 scale."
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Number the jars from 1, 2, ... 9. Jar number k take k marbles.
Total have 45 marble. Now scale 45 marbles. If the scale displays 45.x, then x is the jar contains 1.1 gram marble.
- Interview Candidate on Dec 8, 2013 Flag Response

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