Intern Interview Questions

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You got some baby bottle samples. You would like to know the max height you can drop it without breaking the bottle. Let set the unit as 1 foot. And the highest height you can reach is at N feet. So how would you find the (max) safe height?
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Software Development Engineer Intern

Interviewed at Amazon

3.5
Jan 28, 2012

You got some baby bottle samples. You would like to know the max height you can drop it without breaking the bottle. Let set the unit as 1 foot. And the highest height you can reach is at N feet. So how would you find the (max) safe height?

I had one question for each interview and both were probability puzzles. Here is the tougher one: you have a bag of N strings, and at random, you pull out a end. You pull out another end and you tie the two ends together. You take another two string ends and tie them together. You repeat this until there are no loose ends left to pull out of the bag. What is the expected number of loops?
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Business Operations Intern

Interviewed at Meta

3.6
Feb 6, 2014

I had one question for each interview and both were probability puzzles. Here is the tougher one: you have a bag of N strings, and at random, you pull out a end. You pull out another end and you tie the two ends together. You take another two string ends and tie them together. You repeat this until there are no loose ends left to pull out of the bag. What is the expected number of loops?

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