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anonymous

  • one year ago

Find the sum of the following infinite geometric series, if it exists. 1/2 + (-1/4) + 1/8 + (-1/16) +...

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  1. welshfella
    • one year ago
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    Sum to infinity = a1 /( 1 - r)

  2. welshfella
    • one year ago
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    where a1 = first term and r = common ratio

  3. anonymous
    • one year ago
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    so far i have r=-1/2

  4. welshfella
    • one year ago
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    thats correct

  5. anonymous
    • one year ago
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    does S=1/4?

  6. anonymous
    • one year ago
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    i'll put my work on a whiteboard

  7. anonymous
    • one year ago
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    |dw:1436731648286:dw|

  8. welshfella
    • one year ago
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    yea and 2/6 simplifies to ?

  9. anonymous
    • one year ago
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    1/4

  10. welshfella
    • one year ago
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    ?????

  11. anonymous
    • one year ago
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    sorry 1/3

  12. welshfella
    • one year ago
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    yes

  13. anonymous
    • one year ago
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    cool. thanks again for your help :)

  14. welshfella
    • one year ago
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    yw

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