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13. If the quadratic equation x (x + 1) ...

13. If the quadratic equation x (x + 1) + (x + 1) (x + 2) + ..... + (x + n-1) (x + n) = 10n for positive integers n The ordinal integer is the solution, then the value of n is equal. [JEE (Main) 2017, (4, -1), 120] (1) 12 (2) 9 (3) 10 (4) 11

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