If, for a positive integer n, the quadratic equation, `x(x + 1) + (x + 1)(x + 2) +.....+ (x +bar( n-1))(x + n) = 10n` has two consecutive integral solutions, then n is equal to

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, 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

If f(x) =(p-x^n)^(1/n) , p >0 and n is a positive integer then f[f(x)] is equal to

If f(x) =(p-x^n)^(1/n) , p >0 and n is a positive integer then f[f(x)] is equal to

If n is a positive integer then the coefficient of x ^(-1) in the expansion of (1+x) ^(n) (1+ (1)/(x)) ^(n) is-