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Clearly, each number in the sequence is two less than the previous number, and it starts with 10, so it would have to be something like 10 - 2n. However, this gives the terms "one off", so it needs an additional adjustment. If you start with 12, you get the correct sequence: 12 - 2n. This is equivalent to 2(6-n).

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Archie Fenna

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Q: What is the nth term for 10 8 6 4 2?
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