Calculate the number 393
NUMBERMANIA: Calculate the number 393 using numbers [7, 4, 4, 6, 29, 113] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers: 1
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Polaroid Land CameraIn 1948, the Polaroid Land Camera first went on sale, at a Boston department store. The 40 series, model 95 roll film camera went on sale for $89.75. This first model was sold through 1953, and was the first commercially successful self-deleveloping camera system. A sepia-coloured photograph took about one minute to produce. Edwin H. Land had previously demonstrated his invention of instant photography at a meeting of the Optical Society of America on 2 Feb 1947. His first commercial success came in 1939 with his invention of Polaroid filters for lenses in products such as ski goggles, sunglasses and slip-on sunglasses for optical glasses. |