Discussion
Assertion (A): Only two chromaticity coordinates need be quoted.
Reason (R): The three always sum to one, so the third follows from the other two.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Since \( x+y+z=1 \), the third coordinate carries no information the first two do not already contain. That is exactly what makes a two-dimensional chromaticity diagram possible - and it is also why chromaticity alone cannot describe a colour, the luminance having been normalised away.
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