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You have two non-uniform ropes and a bunch of matches. Each rope takes an hour to burn, but the two ropes are not identical, and it does not burn uniformly (i.e. after half the rope has burned, it has not been a half hour; either more or less than that has passed). How can you measure exactly 45 minutes?

Software Engineering Intern

Interviewed at Skarven Enterprises

5★
Apr 11, 2011

You have two non-uniform ropes and a bunch of matches. Each rope takes an hour to burn, but the two ropes are not identical, and it does not burn uniformly (i.e. after half the rope has burned, it has not been a half hour; either more or less than that has passed). How can you measure exactly 45 minutes?

Asked three arithmetic and probability questions. Honor code of not using a calculator or paper and pen/pencil. Arithmetic: 1. 18/5 2. 76+57 3. 99*99 Probability: 1. A fair coin is flipped three times, what is the probability that it will land on heads at least once.

Intern Assistant Trader

Interviewed at Gray Whale

4.6★
Oct 23, 2012

Asked three arithmetic and probability questions. Honor code of not using a calculator or paper and pen/pencil. Arithmetic: 1. 18/5 2. 76+57 3. 99*99 Probability: 1. A fair coin is flipped three times, what is the probability that it will land on heads at least once.

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