Find the sum of n terms of the arithmetic-geometric sequence.

Find the sum of the first n terms of the arithmetic sequence 1/n,3/n,5/n,7/n ,.......

Let S be the sum of the first n terms of the arithmetic sequence 3, 7, 11, ...., and let T be the sum of the first n terms of the arithmetic sequence 8 , 10 , 12 ,.... For n gt 1 , S = T for

If the sum of n-term of an arithmetic progression sequence 25,22,19,... is 116 , then find the last term.

If the sum of second and tenth terms of an arithmetic sequence is equal to 12, then find the sum of fourth, sixth and eighth terms.

Find the sum to infinity of the following arithmetic geometric sequence. 1, 2/4, 3/16, 4/64

Find the sum to infinity of the following arithmetic geometric sequence. 3, 6/5, 9/25, 12/125, 15/625

Find the sum to infinity of the following arithmetic geometric sequence. 1, 4/3, 7/9, 10/27 ……

Can 240 be the sum of consecutive terms of an arithmetic sequence '7,11,15, ………..'

Consider an arithmetic sequence with common difference 20. If the sum of reciprocals of two consecutive terms of this sequence is 1//24 find the first term of the arithmetic sequence .

The sum of first n terms of an arithmetic sequence is n^2+2n What is the sum of first 20 terms of this sequence?