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Find the missing number

Try to solve this mathematical puzzle. Find the missing number.

Correct answers: 71

The first user who solved this task is Roxana zavari.

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Proof of my insanity

Proof of my insanity was when I stole a dried grape from a cow: Textbook unraisin-a-bull behaviour.

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Peter Mark Roget

Born 18 Jan 1779; died 12 Sep 1869 at age 90.English physician who, in 1814, invented a "log-log" slide rule for calculating the roots and powers of numbers. After studying medicine at the University of Edinburgh, he helped establish a medical school at Manchester, and practiced in London (1808-40). Upon retirement, from age 61 to 73, he produced his famous Thesaurus of English Words and Phrases (1852). He was a fellow of the Royal Society from 1815, and its secretary from 1827.

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