The Ratio Test

This video explains how to apply the ratio test to determine if an infinite series converges or diverges.

[rockyboy]

Thank you sir. I cannot express how helpful your videos are to me.

[ssd]

I salute you bro....I am short of a thankful word to give you....Your videos are more helpful than you would imagine...Keep it up and God has a reward for you...! Cheers.

[DxROC]

Loved how you pointed out for what type of series this test works best! Awesome! Thank you very much!

[robbinshee]

I prefer your online video than my real professor in class. Thank for posting your video

[paulmesler]

I looked in so many places to get a clear understanding of this and you delivered. Liked and subscribed.

[thando]

i cud say the absolute same! this guy is amazing. i hope i pass my exam

[afreymiller]

Thank you so much for doing these videos!

[ericalas]

these videos are amazing thank you very much for these!

[ValenceElectron]

You sir are a very helpful man. Thank you very much!!

[faisalaseeri]

well done....and thanks for humaniterian efforts

[wagagagaggag]

Just a quick question. Is it possible for us to use ratio test on every series except the ones which L=1? because i find it's simple just to memorize this test rather than thinking about using other test. 

[Diggidydave]

Thank you, that was very clear and helpful :)

[sumanpaul]

Thanks a lot. It is very helpful to me.

[josanne]

question! ... if it were any other number besides (-1)....would you still be able to ignore it?

[potresto]

The problem with using the geometric series test is this: the form must be a*r^n, where a and r are constants. In the case of that problem, you have n*(5/4)^n, where n is changing at each increment in the series. So, the geometric series test is not applicable. Nice try though!

[ditke]

If the terms are positive why do we need the absolute value?