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Mathematics 14 Online
OpenStudy (anonymous):

0.9+0.09+0.009... What are the first four terms of the sequence of partial sums?

OpenStudy (campbell_st):

a = 0.9 r = 0.1 \[s _{4} = 0.9\times(1-0.1^3)/(1 - 0.1)\]

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