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lindseyharrison

  • 3 years ago

What is the sum of the geometric sequence 1, 3, 9, … if there are 12 terms? 292,524 265,720 139,968 104,976

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  1. timo86m
    • 3 years ago
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    ooh i like these

  2. timo86m
    • 3 years ago
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    a=1 r*a^0+r*a^1+r*a^2...

  3. timo86m
    • 3 years ago
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    oh wait switch a and r the r has the ^ not the a

  4. ParthKohli
    • 3 years ago
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    \[S = {1 - r^n \over 1 - r} \]

  5. lindseyharrison
    • 3 years ago
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    B?

  6. timo86m
    • 3 years ago
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    265720

  7. timo86m
    • 3 years ago
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    YES :)

  8. lindseyharrison
    • 3 years ago
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    yay!! Thank you :)

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