find the series of 9,28,65,?,217
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The series 2,9,28,65,_,217 is (N^3+1) where N starts from 1.
(1^3)+1 = 1+1 =2
(2^3)+1 = 8+1 =9
(3^3)+1 = 27+1 =28
(4^3)+1 = 64+1 =65
(5^3)+1 = 125+1 =126
(6^3)+1 = 216+1 =217
The missing number is 126.
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