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There's a rule?
The rule for multiplying by 1 is, everything multiplied by 1 is the answer.For example, 2multiplied by 1 is 2.
The rule depends on what you wish to do with the ratio.
England
There are infinitely many cubic functions that can be the rule for the above set of numbers. The simplest, though, is the linear rule: Un = 8n - 1 for n = 1, 2, 3, ...