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Can you replace the question mark with a number?

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

Correct answers: 35

The first user who solved this task is Nasrin 24 T.

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Gun off a 3D printer

I heard that you can now print a gun off a 3D printer, but I am not impressed.

I’ve had a Canon printer for years.

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Robert Noyce

Born 12 Dec 1927; died 3 Jun 1990 at age 62.Robert Norton Noyce was an American engineer and inventor (1959), with Jack Kilby, of the integrated circuit, a system of interconnected transistors on a single silicon microchip. He held sixteen patents for semiconductor devices, methods, and structures. In 1968, he and colleague Gordon E. Moore cofounded N.M. Electronics, which later was renamed Intel Corporation. Noyce served as Intel's president and chairman (1968-75), then as vice chairman until 1979.

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