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What is the missing number?

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

Correct answers: 45

The first user who solved this task is Thinh Ddh.

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A husband stepped on one of th...

A husband stepped on one of those penny scales that tell you your fortune and weight and dropped in a coin.
"Listen to this," he said to his wife, showing her a small, white card. "It says I'm energetic, bright, resourceful and a great lover."
"Yeah," his wife nodded, "and it has your weight wrong, too!"

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Richard Dagobert Brauer

Died 17 Apr 1977 at age 76 (born 10 Feb 1901).German-American mathematician and educator, a pioneer in the development of algebra theory. He worked with Weyl on several projects including a famous joint paper on spinors (published in 1935 in the American Journal of Mathematics). This work provided a background for Paul Dirac's theory of the spinning electron within the framework of quantum mechanics. With Nesbitt, Brauer introduced the theory of blocks (1937). Brauer used this to obtain results on finite groups, particularly finite simple groups, and the theory of blocks would play a big part in much of Brauer's later work. Starting with his group-theoretical characterisation of the simple groups (1951), he spent the rest of his life formulating a method to classify all finite simple groups.

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