Find the sum of first n terms of the series `1^(3)+3xx2^(2)+3^(3)+3xx4^(2)+5^(3)+3xx6^(2)`+.. When
(i) n is even (ii) n is odd

Find the sum of first n terms of the series 1^3+3xx2^2+3^3+3xx4^2+5^3+3xx6^2+ w h e n n is even n is odd

The sum of first n terms of the series 1_(2) + 2.2^(2) + 3^(2) + 2.4^(2) + 5^(2) + 2.6^(2) + ...... is (n(n + 1)^(2))/4 when n is even. When n odd the sum is

Find the sum to n terms of the series 3+33+333+… to n terms.

Find the sum to n terms of the series 3//(1^2xx2^2)+5//(2^2xx3^2)+7//(3^2xx4^2)+dot

Find the sum to n terms of the series 1//(1xx2)+1//(2xx3)+1//(3xx4)++1//n(n+1)dot

Find the sum of the first n terms of the series 1/(sqrt(2) + sqrt(3)) + 1/(sqrt(3) + sqrt(4)) +...

Find the sum to n terms of the series 1^2+2^2+3^2-4^2+5^2-6^2+. . . .

Find the sum to n terms of each of the series in 1xx2+2xx3+3xx4+4xx5+....