The web site asks - true or false - "Blue, cyan, yellow, green and magenta
are seen in the rainbow."
The answer is false, because magenta (blue+red) isn't seen. The others -
including green and yellow - are certainly seen but since it says "and"
then by strict logic, the statement as a whole is indeed false. I think
the answer is poorly worded and misleading, but it is, strictly speaking,
correct.
Timothy Folkerts
Department of Physics
Fort Hays State University
Hays, KS 67601
785-628-4501
"The only thing necessary for the triumph of evil is for good men to do
nothing." - Edmund Burke