Find the sum `1^2+(1^2+2^2)+(1^2+2^2+3^2)+…. "up to "22^(nd)` find the sum when n is odd .

Find the sum 1^2+(1^2+2^2)+(1^2+2^2+3^2)+ up to 22nd term.

Find the sum 1^2+(1^2+2^2)+(1^2+2^2+3^2)+ up to 22nd term.

Find the sum: 3(1)/(2)+7

Find the sum 1+(1+2)+(1+2+2^(2))+(1+2+2^(2)+2^(3))+ …. To n terms.

Find the sum of the series 1 . 3^(2) + 2.5 ^(2) + 3.7^(2) +…+ to n terms

Find the sum, sum_(k=1) ^(20) (1+2+3+.....+k)

Find the sum sum_(r=1)^n r(r+1)(r+2)(r+3)

The sum of the first n terms of the series 1^2+ 2.2^2+3^2 +2.4^2+.... is (n(n+1)^2)/2 when n is even. Then the sum if n is odd , is

Find the 1+2.2+3.2^2+…….+t_n

If the sum of 1+2+2^(2)+ . . . . . . . . . .+2^(n-1) is 255, find the value of n.