(1a): write down the sum of the first n terms of this sequence
(1b): |x|<1 find lim Sn as n=>infinity
(1c): if An=sum r=1 to n Sr,show that
Please help me show working this one difficult for me
as with any geometric sequence,
Sn = a(1-r^n)/(1-r)
So, since a=x and r=x,
Sn = x(1-x^n)/(1-x)
1b) S = a/(1-r) = x/(1-x)
1c should not be too hard now.
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