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There are infinitely many polynomials of order 5 that will give these as the first two and fifth numbers and any one of these polynomials could be "the" rule. Each rule will generate a different set of answers for the missing numbers. Short of reading the mind of the person who posed the question, there is no way of determining which of the infinitely many solutions is the "correct" answer.The simplest solution is based on a quadratic polynomial (order 2):U(n) = -1.75*n^2 - 0.75*n + 147.5 for n = 1, 2, 3, ...Accordingly, the three missing numbers are:129.5, 116.5 and 80.

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145, 139, 129.5, 116.5, 100, 80.

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9y ago
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Q: What are the missing numbers in this sequence 145-139-x-x-100-x?
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