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anonymous

  • one year ago

Find the sum of the first seven terms of the sequence 4, 12, 36, 108, … . 1,456 1,457 4,372 4,374

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  1. arindameducationusc
    • one year ago
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    Its a GP

  2. anonymous
    • one year ago
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    what

  3. anonymous
    • one year ago
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    Okay the easy way I do this is first find the pattern. Do you know what the pattern is?

  4. arindameducationusc
    • one year ago
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    Common ratio is 3

  5. arindameducationusc
    • one year ago
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    use S=a(r^n-1)/(r-1)

  6. anonymous
    • one year ago
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    Yes okay so now do 108*3*3*3

  7. anonymous
    • one year ago
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    And write down each number that shows when you hit equal

  8. arindameducationusc
    • one year ago
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    r here is3, a is 4

  9. arindameducationusc
    • one year ago
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    n is 7

  10. arindameducationusc
    • one year ago
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    4(3^7-1)/3-1 , we get.................

  11. arindameducationusc
    • one year ago
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    4372

  12. anonymous
    • one year ago
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    324, 972, 2916 so you add 4, 12, 36, 108, 324, 972, 2916 together. We get 4372

  13. arindameducationusc
    • one year ago
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    got it?

  14. anonymous
    • one year ago
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    got it?

  15. arindameducationusc
    • one year ago
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    good job @alexistheking77

  16. anonymous
    • one year ago
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    thank you so much i appreciate it

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