Skip to content

Salam Academy

Sign in Create account

LearnEdexcelYMA012018 specificationWMA12 · Pure Mathematics 2Sequences and series

WMA12 · Module

Sequences and series

4 subtopics≈ 165 min in total

Start the module: Binomial expansion Open graphing calculator

Binomial expansion
How to expand $(a+b)^n$ without multiplying out $n$ brackets, using Pascal's triangle or $\binom{n}{r}$ , and how to pick out one term, such as the coefficient of $x^3$ or the term independent of $x$ .
≈ 45 min
Arithmetic progressions
Sequences that go up (or down) by the same amount each time: the $n$ th term, the sum of the first $n$ terms and why it works, and how to find unknowns from given terms or sums.
≈ 40 min
Geometric progressions
Sequences that multiply by the same number each time: the $n$ th term, the sum of the first $n$ terms and its proof, finding unknowns, and the growth and decay problems they model.
≈ 45 min
Sum to infinity
How adding infinitely many numbers can give a finite answer, the condition $|r|<1$ that makes it happen, and how to use $S_\infty=\dfrac{a}{1-r}$ for recurring decimals, bouncing balls and exam problems.
≈ 35 min