Courses
Teacher-curated, self-paced courses. Looking for a guided sequence through a full topic? See Learning Paths.
3 courses
The Fundamental Principle of Counting
Mathematics · High School (11–12) · Permutations and Combinations
FreeCh 4 · 1/4
Count choices made one after another with the multiplication principle, separate cases with the addition principle, and meet the factorial.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Permutations
Mathematics · High School (11–12) · Permutations and Combinations
FreeCh 4 · 2/4
Arrangements when order matters: the formula for nPr, arrangements with repeated objects, and arrangements under conditions such as letters that must stay together.
3Lessons11Problems2Python Labs1Question Set1Mock Test
Combinations
Mathematics · High School (11–12) · Permutations and Combinations
FreeCh 4 · 3/4
Selections when order does not matter: the formula for nCr, its properties, and problems that mix selecting and arranging.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Counting: Advanced Problem Set
Mathematics · High School (11–12) · Permutations and Combinations
StandardFirst lesson freeExtra course
The counting problems that JEE, A-Level Further Maths and maths olympiads set most: circular arrangements, distributing objects into groups, the gaps method, and counting by complements and cases, with a full timed paper.
3Lessons12Problems2Python Labs1Question Set1Mock Test
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