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Any number of your choice. It is possible to find a quartic (order 4) polynomial that will fit the given 4 points and any other.

There is only one cubic that will do the trick:

Un = (-3n3 + 26n2 - 63n + 52)/2 for n = 1, 2, 3, ...

and according to it U5 = 6.

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10y ago
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Q: What is the next number in the series 6 3 8 12?
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