A-Level

Probability | AS-Level Maths

Jaisul Naik

14 Apr 2026 — 1 min read

What does P(A) mean?

P(A) is the probability of A happening

What does P(A') mean?

P(A') is the probability of A not happening

What does P(A∩B) mean?

P(A∩B) is the probability of A and B happening

What does P(AUB) mean?

P(AUB) is the probability of only A happening, or only B happening, or both A and B happening

What does P(A|B) mean?

P(A|B) is the probability of A happening given that we know B is also happening.

What does independent mean?

A and B are independent if P(A∩B) = P(A) x P(B)

What does mutually exclusive mean?

A and B are mutually exclusive if P(A∩B) = 0

Venn Diagrams

Question 1

Question 2

Question 3

Probability Tree Diagrams

Question 8

Question 9

Question 10

GCSE Maths | Quadratic Simulataneous Equations

Question 1 Question 2 Question 3

Revision

A-Level MathsGCSE Maths

GCSE Maths

Algebra 1. Quadratics | Revision Number 1. Geometry 1. Statistics 1. A-Level Maths Tutoring I offer one-to-one and small group A-Level Maths tutoring for students across the UK and internationally. With 94+ five-star Google reviews and tutoring experience since 2017, I specialise in helping students understand difficult concepts and improve their

GCSE Maths | Quadratics

Factorising quadratics Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Solving quadratics by factorising Question 7 Solving quadratics with the quadratic formula Question 8 Completing the square x2 + bx + c = (x+b/2)2 - (b/2)2 + c Question 8 Answers: Question 9