The value of `1.1!+2.2!+3.3!+........+9+` terms is equal to

The value of the sum 1.2.3+2.3.4+3.4.5+… upto n terms is equal to

The sum of series 1/(1-3.1^2+1^4)+2/(1-3.3^2+2^4)+3/(1-3.3^2+3^4)+......... up to 10 terms, is equal to

If 1 + (1 + 2)/2 + (1 + 2 + 3)/3 + ...... to n terms is s , then s is equal to

Value of 1+1/(1+2)+1/(1+2+3)+....+1/(1+2+3+....+n) is equal to

The value of the expression sqrt ((1/(sqrt2+1)+1/(sqrt3+sqrt2)+1/(sqrt4+sqrt3)+.........99 terms is equal to

The sum of (3)/(1^(3))+(5)/(1^(3)+2^(3))+(7)/(1^(3)+2^(3)+3^(3))+...... upto 11 terms is equal to

Value of (1^2)/1+(1^2+2^2)/(1+2)+(1^2+2^2+3^2)/(1+2+3)+.... 'n' terms is equal to

the value of x , for which the 6th term in the expansions of [2^(log_2) (sqrt(9^((x-1)+7)))+1/(2^(1/5)(log)_2(3^(x-1)+1))]^7i s84 , is equal to a. 4 b. 3 c. 2 d. 1