Find the sum to n terms of the sequence 8,88,888,8888,……

Find the sum to n terms of the sequence 7,77,777,7777,…….

Find the sum to n terms of the series: 8, 88, 888 ,…..

Find the sum of the sequence 8, 88, 888, 8888, . . . To n terms.

Find the sum to n terms of the sequence 4+44+444+…….

Find the sum of n terms of the following sequences: 8+88+888+……………..up to n terms.

n, 3n, 5n,... is an arithmetic sequence. a) What is the common difference? b) Prove that the sum of first 'n' terms of this sequence is n^(3) . c) Then find the sum of 15 terms of the sequence 15,45,75,…..

Find the sum of the terms of the sequence: 5 + 8+ 11 +……………..+ 68.

Find the sum to n terms of the sequence {a_n} , where a_n=5-6n, n in N .

Find the n term and the sum to n terms of the sequence: ( i ) 1+5+13+29+61+......