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MATH PUZZLE: Can you replace...

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

Correct answers: 604

The first user who solved this task is Roxana zavari.

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Eric Temple Bell

Died 21 Dec 1960 at age 77 (born 7 Feb 1883). Scottish-American mathematician and writer who contributed to analytic number theory (in which he found several inportant theorems), Diophantine analysis and numerical functions. In addition to about 250 papers on mathematical research, he also wrote for the layman in Men of Mathematics (1937) and Mathematics, Queen and Servant of Science (1951) among others. Under the name of John Taine, he also wrote science fiction.«

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