It is: 25-7n
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Un = 25 - 7n
7n - 3
The nth term is 7n-3 and so the next term will be 39
If you mean: 6 12 18 24 then the nth term is 6n
The nth term can be anything you like! However, the simplest poynomial that fits these points is given by the rule: Un = n2 + 2 for n = 1, 2, 3, ...