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[" 10.If for a positive integer "n," the...

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

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