Lesson
Lesson-11.1.2- know and use the notation n! (with 0! = 1), and the expressions for permutations and combinations of n items taken r at a time.
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Lesson-11.1.1- recognise and distinguish between a permutation case and a combination case.PreviousLesson-11.1.3- answer simple problems on arrangement and selection (cases with repetition of objects, or with objects arranged in a circle, or involving both permutations and combinations, are excluded).Next