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Dropbox User Operations Agent Interview Question

I interviewed in Austin, TX and was asked:
"There are two children, 5 and 6 year olds who understand addition and subtraction. They do not understand multiplication or division. How would you explain the concept of prime numbers to them?"
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Part of a User Operations Agent Interview Review - one of 275 Dropbox Interview Reviews

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Take 11 (prime number) objects and ask the children to split the objects into 2 groups with the same number of objects in each. Repeat the process and ask the children to split the 11 objects into 3 separate groups. There will always be one group with an extra object.
- Interview Candidate on Nov 1, 2013 Flag Response

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