find the next number 10, 45, 120, 210
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this sequene is a cubic sequence , the differnece of the difference of the difference of the pattern converges
look at the pic
how did i get 290?
i found that the 3rd difference was -25 , adding -25 to 15 gave -10, adding -10 to 90 gave me 80 and then adding 80 to 210 gave me 290
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