Basic Tree Diagram Structure
Part of Tree Diagrams · GCSE GCSE Mathematics revision
This diagram covers Basic Tree Diagram Structure within Tree Diagrams for GCSE Mathematics. Revise Tree Diagrams in Probability for GCSE Mathematics with 15 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 3 of 7 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.
Topic position
Section 3 of 7
Practice
15 questions
Recall
20 flashcards
Basic Tree Diagram Structure
Example: Two Coin Flips
First Coin Second Coin Outcome Probability
H ————————— HH 1/2 × 1/2 = 1/4
H (1/2) ————————/
/ \ \
/ \ T ————————— HT 1/2 × 1/2 = 1/4
Start \
\ \
\ \
T (1/2) ————————/
\
H ————————— TH 1/2 × 1/2 = 1/4
T ————————— TT 1/2 × 1/2 = 1/4
Check: All probabilities add to 1: 1/4 + 1/4 + 1/4 + 1/4 = 1 ✓
Keep building this topic
Read this section alongside the surrounding pages in Tree Diagrams. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Tree Diagrams
A fair coin is flipped twice. In a tree diagram, what must the probabilities on the branches from the same point always add up to?
Explain the two key rules used when calculating probabilities from a tree diagram. Your answer should refer to both the multiplication rule and the addition rule.
Quick Recall Flashcards
15 questions on Tree Diagrams — practise free
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