You're talking nonsense. With three primary colors red, blue, and yellow, mixing red and blue makes magenta. You can call magenta a combination of red and blue or you can call it an absence of yellow.
That's not quite the whole story.
If you are mixing paint, ink, dye, stains...that kind of thing - then you're undertaking "subtractive" mixing - and each new color subtracts from the color of the medium beneath (eg white paper). In subtractive mixing, the primaries are cyan, magenta and yellow (the colors that you find in your inkjet printer) - although these can be approximated as (respectively) blue, red and yellow.
If you are mixing light (as for example, the computer or phone screen that you're looking at right now does) - then you're undertaking "additive" mixing where each new color adds to the color that's already there. In additive mixing the primaries are red, green and blue (the colors you can see in your computer display if you take a magnifying glass to an area of "white" screen).
So in light, red+blue=magenta, green+blue=cyan, red+green=yellow, red+green+blue = white.
But in ink (etc) cyan+yellow=green, magenta+yellow+red, cyan+magenta=blue and cyan+magenta+yellow = black...although it can be hard to tell because you can't really purchase primary colored ink in a paint box...the only pure sources are in things like inkjet printer cartridges...and even then, cyan+magenta+yellow only makes a dirty brown - which is why real inkjet printers add black ink too so we can get true blacks and greys.
Our eyes detect red, green and blue. So subtractive inks block the complements of the colors they say they are. cyan ink is really "red-blocking-ink" so when white light is passed through it, the red is absorbed and the green and blue light that shines through combine to make cyan light.