Write algebra of the sum of the sequence 6n + 5. Can the sum be 2000? Why?

Write the first three terms of the sequence defined by a_(n) = 2n + 5 .

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

Write the first five terms of the sequence defined by a_n=2n+5

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

If the arithmetic progression whose common difference is nonzero the sum of first 3n terms is equal to the sum of next n terms. Then, find the ratio of the sum of the 2n terms to the sum of next 2n terms.

Find the sum of the series 5,55,555,5555, … to n terms ?

Write the first three terms of the sequence a_n=(-1)^(n-1)5^(n+1) .