Usage History of 'unsolvable'

The following chart shows how frequently 'unsolvable' appeared in printed materials over time. For example, the word 'unsolvable' occurred 2 times in books in 1703 and 7,747 times in 2008. From 1703 to 2008, the word 'unsolvable' was used a total of 181,440 times in books scanned by Google. See Reference: Google Ngram project.

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