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What is the next number in the series 3 6 9 15 21?

Updated: 12/18/2022

Wiki User

∙ 12y ago

Best Answer

The next number is 18.

This is obtained by fitting the quartic polynomial

t(n) = (-n4 + 12n3 - 47n2 + 84n - 36)/4 for n = 1, 2, 3, etc.

Wiki User

∙ 12y ago

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