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.....
If, for example, the green had considerable reflection down
to about 470, and the blue had considerable reflection up to
about 500, then the overlap region would indeed appear cyan
to the average person.
However, a blue pigment that extends to 500 is not something I
would call "pure blue," and a green pigment that extends to 470
is not something I would call "pure green."
I would indeed answer the question as "black" and I assume
(I hope) the answer key is a misprint.