Formulas

Set Theory Formulas – IGCSE Maths

Every set theory formula you need for Cambridge IGCSE Mathematics 0580, with clear explanations of when and how to use each one.

n(A∪B) = n(A) + n(B) − n(A∩B)

Core

n(A \cup B) = n(A) + n(B) - n(A \cap B)

Key formula for set theory in IGCSE Maths.

Use when working with set theory problems.

Show your substitution clearly for method marks.

Core

A' = \text{elements not in } A

Key formula for set theory in IGCSE Maths.

Use when working with set theory problems.

Show your substitution clearly for method marks.

Extended

(A \cup B)' = A' \cap B'

Key formula for set theory in IGCSE Maths.

Use when working with set theory problems.

Show your substitution clearly for method marks.

Core

\text{Overlapping circles show relationships}

Key formula for set theory in IGCSE Maths.

Use when working with set theory problems.

Show your substitution clearly for method marks.

Struggling to remember these formulas?

Teacher Rig helps students master them through practice, not memorisation.

Which set theory formulas are given in the exam?

Check the IGCSE formula sheet provided in your exam. Some set theory formulas must be memorised.

How do I remember set theory formulas?

Practice using them in past paper questions. Repeated application is more effective than rote memorisation.

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