Question

If for a positive integer n the quadratic equation
x(x + 1) + (x + 1) (x + 2) + ... + (x + (n -1))
(x + n) = 10 n has two consecutive integral
solutions, then n equals (JEE (Main) 2017]
(A) 11
(B) 12
(C) 9
(D) 4
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Answer 1

Answer:

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