Find the sum to n terms of each of the following series :
`(1^(2)) + (1^(2)+2^(2)) + (1^(2) + 2^(2) + 3^(2)) +…`

Find the sum to n terms of each of the following series : 1^(2) + 3^(2) + 5^(2) +…

Find the sum to n terms of each of the following series : (1) + (1+2) + (1+2+3)+…

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

Find the sum of n terms of each of the following 1^(2) + ((1^(2) + 2^(2))/(2)) + ((1^(2) + 2^(2) + 3^(2))/(3)) + …..

Find the sum to n terms of each of the following series : n.1 + (n-1).2+(n-2). 3+(n-3).4+…

Find the sum of first n terms of the following series : 1.2^(2) + 2.3^(2) + 3.4^(2)+…

Find the sum to n terms of the following series : 1+2a + 3 a^(2) + 4a^(3) + …, [a != 1]

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

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