anonymous
  • anonymous
What is the sum of the geometric sequence 3, 12, 48, … if there are 8 terms?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
rishavraj
  • rishavraj
see sum of geometric series = \[a_1 \times \frac{ r^n - 1 }{ r - 1 }\] where r is common ratio , n is no of terms and a_1 is the first term
anonymous
  • anonymous
But itsn't it a geometric sequence?

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rishavraj
  • rishavraj
yup it is a geometric sequence..i mentioned it ...
anonymous
  • anonymous
Sorry! You wrote series so I got confused. Anyways, I got 65535 as an answer?
rishavraj
  • rishavraj
yup :))
anonymous
  • anonymous
Yay! Will you help with one more?
rishavraj
  • rishavraj
yeah :))
anonymous
  • anonymous
Given the arithmetic sequence an = 6 − 4(n + 2), what is the domain for n?
rishavraj
  • rishavraj
see n is no or terms so it can only hav positive values
anonymous
  • anonymous
so n>1?
anonymous
  • anonymous
Thanks:)
rishavraj
  • rishavraj
\[n \ge 1\]
anonymous
  • anonymous
yes! Thanks so much:)

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