Find the sum to n terms of the series `1^(2)-2^(2)+3^(2)-4^(2)+5^(2)-6^(2)+…`

Find the sum of the firt 40 terms of the series 1^(2) -2^(2) + 3^(2) - 4^(2) +……….

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 infinity of the series 1^2+2^2x+3^2x^2+oodot

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 each of the series in 1^2 + (1^2 + 2^2) + (1^2 + 2^2 + 3^2) + ...

Find the sum to n terms of each of the series in 3 × 1^(2) + 5 × 2^(2) + 7 × 3^(2) +.........

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

Find the sum of the following series 6^(2)+7^(2)+8^(2)+…+21^(2)