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[" If,for a positive integer "n," the quadratic equation,"],[x(x+1)+(x+1)(x+2)+...+(x+(n)/(n-1))(x+n)=10n],[" has two consecutive integral solutions,then "(x+n)=10n],[[" (a) "11," (b) "12],[" (c) "9," (d) "10]]

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