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The answer will depend on where in the sequence the missing number is:

Using only quartic polynomials, the solutions are:

3, 10, 25, 54, 103

10, 11.75, 25, 54, 103

10, 25, 33.8333..., 54, 103

10, 25, 54, 84.25, 103

10, 25, 54, 103, 178.

Other functional forms will generate many more answers.

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12y ago

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