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

Paul Gottlieb Nipkow

Born 22 Aug 1860; died 24 Aug 1940 at age 80.German engineer who discovered television's scanning principle, in which the light intensities of small portions of an image are successively analyzed and transmitted. Nipkow's invented (1884) a rotating disk (Nipkow disk) with one or more spirals of apertures that passed successively across the picture to make a mechanically scanned television system.

If my memory was any worse

Is swear if my memory was any worse i could plan my own surprise party.
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