Marked as Best Answer
Cyan, Magenta, Yellow (C,M,Y) are used in subtractive color analysis. Pigments do the subtraction.
Red, Green and Blue are used in additive color analysis
In simple terms: C kills incident red light, M kills incident green light, and Y kills incident blue light.
By "kills" it is meant that the pigment absorbs the indicated color, removing it.
In this model incident white light is an equal parts mixture of red, green and blue.
So for 1) Red and Green are killed leaving only Blue
for 2) Yellow light is what survives after blue is removed, so is Red + Green. The Cyan will kill the red leaving only Green
for 3) Neither M nor Y kills red, so the Red survives untouched.
for 4) Magenta will kill green, so nothing survives - the surface will appear black.
for 5) A red pigment (mixture of M and Y pigments) kills Blue and Green. Magenta light is Red + Blue, so only Red light survives
for 6) Cyan light is Green + Blue . So Blue survives.
In summary, your answers are correct except for numbers 4 and 5.