Coded Inequalities

intermediate24 min read

Symbols stand in for the relations greater-than, less-than, equal, at-least and at-most. How to decode the symbols, build one combined chain, test each conclusion for a definite result, and spot the either-or complementary pair.

What you will be able to do

Replace each coded symbol with its plain relation before doing anything else.
Join the statements into a single chain and read the relation between two letters off it.
Decide whether a conclusion is definitely true, not just possibly true.
Recognise the either-or case: two conclusions that are individually uncertain but together exhaustive.

What is inside this lesson

1What the question gives you
2Decode, then build one chain
3Definite, not merely possible
4The either-or case
5Worked examples
6Common mistakes
7Quick revision
8Practice

The lesson itself is for members

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