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### Larry Fields says

That answer is reasonable. However there are infinitely many reasonable answers for any Number Series Question. Problem is: In the standardized tests that use NSQs, only one answer is considered to be 'correct'. NSQs measure two things.

•Basic mathematical ability.

•And one's ability to read the mind of the person who asked the question!

### Thesource says

I got the same answer, 677. My equation for that series happened to be the same.