More Lessons for A Level Maths

Math Worksheets

A collection of videos, activities and worksheets that are suitable for A Level Maths.

Permutations of n different items

In this tutorial, I show you what we mean by a permutation, and how to work them out for n different items.

You are shown the number of arrangements of r items from n and how to use nPr function

In this video tutorial, I show you how to calculate how many arrangements or permutations there are of letters in a word where a letter is repeated. The words EYE and STATISTIC are used as examples.

You are shown how to handle questions where letters or items have to stay together.

In this tutorial I show you how to calculate how many arrangements or permutations when letters or items are restricted to the ends of a line.

How to calculate permutations where no two items the same must be together.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.