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What comes next?
The series follows the following sequence; 6 + 4 = (6 – 4)(6 + 4) = 210 Similarly; 9 + 2 = (9 – 2)(9 + 2) = 711 Therefore; 15 + 3 = (15 – 3)(15 + 3) = 1218 ANswer = 1218