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Choose any number: it is possible to find a polynomial of order 4 such that it forms the rule for the numbers given in the question and your chosen number.

The polynomial

Un = (n3 - 9n2 + 30n - 18)/2 for n = 1, 2, 3, ... fits the given numbers. The next number is 16.

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11y ago
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Q: What number comes next in 2 7 9 11?
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