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Calculate the number 600

NUMBERMANIA: Calculate the number 600 using numbers [9, 2, 5, 9, 61, 721] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 0

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Ewald Hering

Died 26 Jan 1918 at age 83 (born 5 Aug 1834).Karl Ewald Konstantin Hering was a German physiologist and psychologist whose chief work concerned the physiology of colour perception. He taught at several universities. Hering challenged the colour-vision theory of Hermann von Helmholtz. Visual sensations, according to Hering's view, were due to three colour receptors responding in an “opponent” fashion in colour-pairs (white/black, yellow/blue, and red/green) to take account of the after-images of colours. Helmholtz had advocated the three fibre, three color theory (red, green and blue). Hering also is known for a classic optical illusion.[Image: Hering (inset) with his colour-blindness apparatus]

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