Symbol Coding — Revision Notes

⚡ 30-Second Revision

Write the key afresh for each question.
Decode first; evaluate second.
Preserve brackets and relation direction.
A common lower bound does not order two quantities.
Parent does not specify gender.
Test uncertainty with two valid examples.

2-Minute Revision

Treat coded notation as a translation layer. After replacing symbols, solve the resulting arithmetic, inequality or relationship problem using its own rules. Do not carry a symbol's familiar meaning into a question that redefines it. Keep strict inequalities distinct from non-strict ones, and do not reverse an asymmetric relationship. If two conclusions remain possible, demonstrate both instead of inventing a missing rule. The final answer should be expressible in ordinary language.

5-Minute Revision

Define P △ Q to mean P ≥ Q and P ○ Q to mean P < Q. From A △ B and B ○ C, can A be compared uniquely with C? Try B = 4, C = 7 and A = 5; then A < C. Keep B and C fixed but choose A = 9; now A > C. A = 7 gives equality. All satisfy the coded premises. The correct conclusion is that no unique A–C comparison follows. Contrast this with A > B and B ≥ C, where A > C is forced.

Vyyuha Quick Recall

Key → Translation → Rule → Check. Decode the notation before reasoning with it.