anonymous
  • anonymous
Find S9 for the series 1 + 5 + 25 + 125 +... i cnt be anything? bc i got 0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Michele_Laino
  • Michele_Laino
it is a geometric sequence whose first term is a1= 1 and constant q is 5
anonymous
  • anonymous
okay
Michele_Laino
  • Michele_Laino
so: \[\Large {S_9} = {a_1}\frac{{1 - {q^9}}}{{1 - q}} = 1 \cdot \frac{{1 - {5^9}}}{{1 - 5}} = ...?\]

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anonymous
  • anonymous
488281
Michele_Laino
  • Michele_Laino
that's right!
anonymous
  • anonymous
Find S10 for the series 1 + 2 + 4 + 8 +... is it the same formula if its not mulitpying by 2?
Michele_Laino
  • Michele_Laino
here we have: first term= 1 constant= 2 so: \[\Large {S_{10}} = {a_1}\frac{{1 - {q^{10}}}}{{1 - q}} = 1 \cdot \frac{{1 - {2^{10}}}}{{1 - 2}} = ...?\]
anonymous
  • anonymous
1023
Michele_Laino
  • Michele_Laino
correct!

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