I need confirmation that I'm applying the ratio test correctly. I'm not certain if I'm setting that up correctly. If it's correct, It should be easy from this point on.
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I think your (2n+3) should be (2n+1), shouldn't it? There are n terms in the multiplication of odd numbers in the denominator of the nth element of the series. Otherwise, it looks fine to me.
Yes, that's right. I checked it.
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