Which color listed below is not a primary color?

Peter oh puhleeese. This is trivia, not a PhD dissertation. If you can’answer a simple question the fault is yours, not the questioners..

Did some painting with blue and yellow paint. Had a coupled of pieces of wood and let the kids make green, blue, and yellow smears all over. We sawed them up and stuck them wherever. Lots of fun.

It's my favourite colour and has been all of my life ... but green is not a primary colour ...

Huh who knew green is my favorite color.

Bob Goodall, I agree. That is why this is a bad question.

tbear, What you said is true for paint; however, for light red and green make yellow. That is why this is a very bad question.

Peter Timmins, I agree.

Mic Fenst, I totally agree.

John W Shreve, You are wrong for light. With light, the primary colors are red, blue and green. Red and green make yellow. However with paint you are correct. The primary colors are red, yellow, and blue. Yellow and blue make green. That is why this is a bad question.

Jaimi McEntire, I agree, that is why this is a bad question.

Brian Fronek, I agree. Yellow is a primary color for paint, but not light. However, green is a primary color for light but not paint. That is why this is a bad question.

Ken Putnam, I totally agree. That is why this is a bad question.

Lancashireredrosebabe , It depends which country you are in. In the UK it is spelt colour, while in the US it is spelt color.

Roger Pelland, I agree, thus this is a bad question.

John Nowak, I totally agree.

timwhitestevens, However you are correct for light. Thus this a bad question.

Richard Jamieson, You are partially correct and wrong. Yellow is a primary color for paint but not light. For light red and green make yellow. Green is a primary color for light, but not paint. For paint blue and yellow make green. Thus this is a very bad question. (see my post on 2/4/2021)

Judith Apple Stewart, You are partially wrong. Yellow is a primary color for paint, but npt light.