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Combinations, what are they and the nCr function : ExamSolutions

In this tutorial I introduce you to what a combination is, how to calculate it using the nCr function and answer the following question. How many different combinations (selections) of 3 letters can be made from the 5 letters ABCDE ? .To see the full index of tutorials visit http://www.examsolutions.co.uk/A-Level-maths-tutorials
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