Asked by Jenn

Are the first four terms of, (∞ Σn=2 (-2)^n-1) 1,-2,-4,-6? Does it Diverge? And is the sum 1/3?
This is just checking my answers!
Answered by Jenn
The infinity symbol is on top of the summation notation and the n=2 is on the bottom of it. then the (-2)^(n-1) is right next to it. Please help!
Answered by oobleck
for a series to converge,
|a_(n+1)/a_n| must be less than 1
clearly this series diverges
Answered by Jenn
Okay, thanks! Would the sum of it be 1/3? I’m not really for sure on if it can even have a sum of 1/3 since the first four terms i got were 1,-2,-4,-6
Answered by oobleck
since it diverges, it cannot have a sum!
Answered by Jenn
You are a blessing! I was iffy about the whole thing. Thank you:)
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