The sum of first 20 terms of the sequence 0.7 ,0.77 , 0.777 …., is

Find the sum of firsts 20 terms of the sequence whose n t h term is a_n=A n+B .

Find the sum of first 14 terms of the sequence -3,3,9,15,…….

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

The sum of the first 25 terms of an arithmetic sequence is 1,400, and the 25th term is 104. If the first term of the sequence is a_(1) and the second term is a_(2) , what is the value of a_(2)-a_(1) ?

Sum to n terms the series : 0.7+0.77 + 0.777+ ....

The sum of 10 terms of the series 0.7+0.77+0.777+……… is -

Find the sum of the first n terms of the series: 0.2 + 0.22 + 0.222+ ....n - terms

The first two terms of a sequence are 0 and 1, The n ^(th) terms T _(n) = 2 T _(n-1) - T _(n-2) , n ge 3. For example the third terms T _(3) = 2 T_(2) - T_(1) = 2 -0=2, The sum of the first 2006 terms of this sequence is :

The sequence 9, 18, 27, 36, 45, 54,….. consists of successive mutiple of 9. This sequence is then altered by multiplying every other term by -1, starting with the first term, to prduce the new sequence -9, 18, -27,36,-45, 54,…….. If the sum of the first n terms of this new sequence is 180, determine n.

Find the sum of first n terms of: 0.7+0.77+0.777+ …..