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If x is 0.3 and y is 0.4, the value of z is

  • A.0.3
  • B.0.4
  • C.0.7
  • D.1.0

Answer: A

Correct answer: 0.3

The three chromaticity coordinates sum to unity by construction, so \[ z = 1 - x - y = 1 - 0.3 - 0.4 = 0.3. \] This is why only two need ever be quoted, and why the diagram is drawn in two dimensions.

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