This Math quiz is called 'Algebra - nth Term' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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The letter n (usually in italics) is often used in algebra to indicate the position of a term in a sequence. This can be a little difficult to grasp but work through this Math quiz (and read the helpful comments!) and you will soon get the idea.