5.2 Permutations and combinations

2 of 2 objectives have lessons · 0 studied · 0 secure

Lessons

Permutations and combinationsUnderstand the difference between permutations (order matters) and combinations (order does not matter). Solve selection problems using nPr and nCr. 8 min, not started
Arrangements with repetition and restrictionsSolve problems about arranging objects in a line where some objects are identical (repetition) or where there are restrictions (e.g. certain objects must be together or separated). 10 min, not started

Syllabus objectives

2 objectives

What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.

5.2.1

Understand the terms permutation and combination, and solve simple problems involving selections.

Taught in: Permutations and combinations · 4 questions

5.2.2

Solve problems about arrangements of objects in a line, including those involving repetition and those involving restriction.

Repetition: e.g. the number of ways of arranging the letters of the word 'NEEDLESS'. Restriction: e.g. the number of ways several people can stand in a line if two particular people must, or must not, stand next to each other. Questions may include cases such as people sitting in two (or more) rows. Questions about objects arranged in a circle will not be included.

Taught in: Arrangements with repetition and restrictions · 5 questions