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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 158

The first user who solved this task is Allen Wager.

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Pluto photographed

In 1930, Clyde Tombaugh photographed the planet Pluto, the only planet discovered in the twentieth century, after a systematic search instigated by the predictions of other astronomers. Tombaugh was 24 years old when he made this discovery at Lowell Observatory in Flagstaff, Ariz.

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