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Microsoft Software Development Engineer In Test (SDET) Interview Question (student candidate)

"Given a range of numbers ordered from 1 to 1 million, what is the most efficient method to find a number that is missing within the range."
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Part of a Software Development Engineer In Test (SDET) Interview Review - one of 3,415 Microsoft Interview Reviews

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Sum up all of the numbers from 1 to 1 million and subtract the sum from the sum of the range of numbers given in the problem to find the missing number.

- Interview Candidate on Apr 26, 2013

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