10x-(1)/(n)=3

(1)/(n-1)-(10)/(n+2)=3

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 is equal to : (1) 10 (2) 11 (3) 12 (4) 9

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 is equal to : (1) 10 (2) 11 (3) 12 (4) 9

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 is equal to : (1) 10 (2) 11 (3) 12 (4) 9

If the sum of the coefficients in the expansion of (1-3x+10x^(2))^(n) isa and if the sum of the coefficients in the expansion of (1+x^(2))^(n) isb, then a=3b b.a=b^(3) c.b=a^(3) d.none of these

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 is equal to : 10 (2) 11 (3) 12 (4) 9

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 : 10 (2) 11(3) 12 (4) 9