Arrange the visible spectrum colours in the order typically seen in a rainbow (from top/outer band to bottom/inner band). 1. Orange 2. Indigo 3. Red 4. Blue 5. Green 6. Yellow 7. Violet

Introduction / Context:
The classic VIBGYOR colour order in a primary rainbow is a standard memory sequence in general science questions.

Given Data / Assumptions:

• Mapping: V=Violet(7), I=Indigo(2), B=Blue(4), G=Green(5), Y=Yellow(6), O=Orange(1), R=Red(3).
• We follow the usual top (outer) to bottom (inner) sequence as commonly taught.

Concept / Approach:
Recall the mnemonic VIBGYOR and map to the provided indices.

Step-by-Step Solution:
Start with Violet → 7.Then Indigo → 2.Then Blue → 4.Then Green → 5.Then Yellow → 6.Then Orange → 1.Finally Red → 3.

Verification / Alternative check:
Matches the standard school-level order V-I-B-G-Y-O-R.

Why Other Options Are Wrong:
Any reordering that swaps adjacent bands or misplaces red/violet contradicts the canonical mnemonic.

Common Pitfalls:
Confusing inner vs outer band orientation; mixing yellow and orange positions.

Final Answer:
7, 2, 4, 5, 6, 1, 3