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

the sum 3/1^2+5/(1^2+2^2)+7/(1^2+2^2+3^2)+....... upto 11 terms

If the sum 3/1^2+5/(1^2+2^2)+7/(1^2+2^2+3^2)+. . . + upto 20 terms is equal to k/21, then k is equal to

The sum of (1/2 . 2/2)/(1^3) + (2/2 . 3/2)/(1^3 + 2^3) + (3/2 . 4/2)/(1^3 + 2^3 + 3^3) + ….. Upto n terms is equal to

Sum of first 20 terms of 3/1^2 + 5/(1^2 + 2^2) + 7/(1^2 + 2^2 + 3^2) +... upto 20 terms is :

3/(1^2 2^2)+5/(2^2 3^2)+7/(3^2 4^2)+ . . . upto 10th term

Find the sum of n-terms: [(1/1)+(1^3 +2^3)/2 +(1^3 +2^3 +3^3)/3+....to n -terms

the sum (3)/(1^(2))+(5)/(1^(2)+2^(2))+(7)/(1^(2)+2^(2)+3^(2))+...... upto 11 terms

If the sum (3)/(1^(2)) + (5)/(1^(2) + 2^(2)) + (7)/(1^(2) + 2^(2) + 3^(2)) + …+ upto 20 terms is equal to (k)/(21) , then k is equal to

The sum up to 60 terms of 3/(1^2) + 5/(1^2 + 2^2) + 7/(1^2 + 2^2 + 3^2) + ……. is equal to

The sum up to 60 terms of 3/(1^2) + 5/(1^2 + 2^2) + 7/(1^2 + 2^2 + 3^2) + ……. is equal to