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Given any number you want for the nth term (n>4), it is possible to find a polynomial of order 4 that will fit these points and the additional one. Consequently, any number can be the nth number - the rule for that is easy to find.

Still, the simplest solution here is a polynomial of degree 1: Un = 0.8n + 2

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10y ago
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Q: What is the nth term for 2.8 3.6 4.4 5.2?
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