Paper 1 · Algebra
⏱ Tested in 2 exam questions since 2023
Lesson 20 of 23
Algebra 20 – Pascal’s triangle
In this lesson you’ll learn to
- Build Pascal's triangle row by row and pick row n + 1 for (x + y)ⁿ
- Expand (x + y)ⁿ with descending x powers and ascending y powers
- Alternate the signs when expanding (x − y)ⁿ
- Simplify terms like 4·(2x)³·(3y), cubing the coefficient with the variable
Most recent exam questions
- 2025 Paper 1 Q5(a) — binomial expansion at low power — either direct multiplication or the binomial theorem w…
- 2023 Paper 1 Q1(b) — specific-term extraction from a binomial expansion, with a 1/x term inside the bracket —…
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