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ridgeboy36

  • 3 years ago

What is the sum of the geometric -4, 24, -144,... if there are 7 terms? Answers to choose from. a)-411,772 b)308,829 c)-159,964 d)119,973

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  1. ridgeboy36
    • 3 years ago
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    @sauravshakya

  2. ridgeboy36
    • 3 years ago
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    @T-Wrx

  3. ridgeboy36
    • 3 years ago
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    @Spectrum

  4. ridgeboy36
    • 3 years ago
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    @sauravshakya can you help me please

  5. sauravshakya
    • 3 years ago
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    There first term is -4 and common ratio is 24/(-4) =-6 Now, Sn = a(r^n -1)/(r-1)

  6. sauravshakya
    • 3 years ago
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    Does it help?

  7. ridgeboy36
    • 3 years ago
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    yes

  8. sauravshakya
    • 3 years ago
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    so, what did u get?

  9. ridgeboy36
    • 3 years ago
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    i got -159,964

  10. ridgeboy36
    • 3 years ago
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    is this correct @sauravshakya ?

  11. sauravshakya
    • 3 years ago
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    very correct

  12. ridgeboy36
    • 3 years ago
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    thank you

  13. sauravshakya
    • 3 years ago
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    welcome

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