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anonymous

  • one year ago

What is the sum of the geometric sequence 3, 12, 48, … if there are 8 terms?

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  1. anonymous
    • one year ago
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    @rishavraj

  2. rishavraj
    • one year ago
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    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

  3. anonymous
    • one year ago
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    But itsn't it a geometric sequence?

  4. rishavraj
    • one year ago
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    yup it is a geometric sequence..i mentioned it ...

  5. anonymous
    • one year ago
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    Sorry! You wrote series so I got confused. Anyways, I got 65535 as an answer?

  6. rishavraj
    • one year ago
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    yup :))

  7. anonymous
    • one year ago
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    Yay! Will you help with one more?

  8. rishavraj
    • one year ago
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    yeah :))

  9. anonymous
    • one year ago
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    Given the arithmetic sequence an = 6 − 4(n + 2), what is the domain for n?

  10. rishavraj
    • one year ago
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    see n is no or terms so it can only hav positive values

  11. anonymous
    • one year ago
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    so n>1?

  12. anonymous
    • one year ago
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    Thanks:)

  13. rishavraj
    • one year ago
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    \[n \ge 1\]

  14. anonymous
    • one year ago
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    yes! Thanks so much:)

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