anonymous
  • anonymous
Find S12 for the series 1 + 1.5 + 2.25 + 3.375 +...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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ParthKohli
  • ParthKohli
A geometric series with common ratio 3/2.
anonymous
  • anonymous
I got 86.49 as the 12 number in the series. Is that correct?
triciaal
  • triciaal
verify that the question is not asking for the 12th term it is asking for the sum of the first 12 terms.

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ParthKohli
  • ParthKohli
Yes, but if you have to find the sum, you use\[S (n) = a\times\dfrac{ r^n-1 }{r -1}\]
anonymous
  • anonymous
okay, I was just wondering if the number that I got for the 12th term was correct.
triciaal
  • triciaal
so you wanted T12 ok T12 = ar^n-1 a= 1, n = 12, r = 3/2 T12 = (1)(3/2)^(12-1) = (3/2)^11 =
anonymous
  • anonymous
I got 258.49 as my over all answer, Is this correct?
anonymous
  • anonymous
IS 258.49 correct for the sum of the terms
triciaal
  • triciaal
|dw:1433909448209:dw|
anonymous
  • anonymous
when I did that I got 257.49?
triciaal
  • triciaal
|dw:1433909575762:dw|

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