Step 1: Additive colour system basics.
- Primary colours in the additive system (used in light, screens, projectors): Red, Green, Blue (RGB).
- When two primary colours are mixed, they produce secondary colours.
Step 2: Deriving secondary colours.
- Red + Green = Yellow
- Red + Blue = Magenta
- Green + Blue = Cyan
Step 3: Triad of secondary colours.
Thus, the three secondary colours are Cyan, Magenta, and Yellow.
\[
\boxed{\text{Cyan, Magenta, Yellow}}
\]
Match the position of feet in Group I to the most appropriate description of stability of human body in Group II.
Group I
P \(\text{Position 1: Feet slightly apart in parallel}\)
Q \(\text{Position 2: Feet apart in a wide stance}\)
R \(\text{Position 3: Feet close together with a narrow stance}\)
S \(\text{Position 4: Feet in a wide cross stance}\)
Group II
1 Stable antero-posteriorly
2 Laterally stable
3 Fairly stable in all directions
4 Vertically stable
5 Unstable
