if `(n+2)! = 210(n-1)!` then the value of n is equal to

If (n + 2)! = 2550 xx n!, then the value of n is equal to

If a_(1) , a_(2), a_(3) , cdots ,a_(n) are in A.P. with a_(1) =3, a_(n) =39 and a_(1) +a_(2) + cdots +a_(n) =210 then the value of n is equal to

If the constant term in the binomial expansion of (x^(2)-(1)/(x))^(n),n in N is 15, then the value of n is equal to.

If the constant term in the binomial expansion of (x^2-1/x)^n ,n in N is 15, then the value of n is equal to.

If ""^(2n+1)P_(n-1): ""^(2n-1)P_n =3:5 then the value of n equals :

If I_(n)=int_(0)^(2)(2dx)/((1-x^(n))) , then the value of lim_(nrarroo)I_(n) is equal to

If I_(n)=int_(0)^(2)(2dx)/((1-x^(n))) , then the value of lim_(nrarroo)I_(n) is equal to

If the coefficients of three consecutive terms in the expansion of (1+x)^n are 45, 120 and 210 then the value of n is

If the coefficients of three consecutive terms in the expansion of (1+x)^n are 45, 120 and 210 then the value of n is