Tyler B.

asked • 08/10/18

Is the series (2/3.4)+(2.4/3.5.6)+(2.4.6/3.5.7.8) converging?

Is there any way to change that into terms of a single variable, so that I can use a suitable convergence test?

1 Expert Answer

By:

Paul M.

tutor
I think maybe the ratio test gives you the answer.  You try it.
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08/10/18

Tyler B.

I attempted this problem by saying since the value of each succeeding term is lower than it's preceding term, the term number infinity would be zero, making the series convegent.
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08/10/18

Paul M.

tutor
That isn't good enough!
The series 1 + 1/2 + 1/3 + … + 1/n diverges despite being a decreasing term series.
 
The ratio test says that if |an+1/an| converges to L< 1, then the series converges; if the ratio converges to L > 1 or blows up, then the series diverges.  I think in this problem the ratio actually converges to 0 and, therefore, the series converges...BUT I am a bit rusty on infinite series and am not absolutely sure.  Good luck!
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08/10/18

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