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• #22208
Ashani Dasgupta
Keymaster

The Pre RMO 2018 Problems are posted here:

https://www.cheenta.com/pre-rmo-2018-solutions/

#22260
saryu mehta
Participant

sir, if by D alemberts ratio test, we get infinity, then the series is convergent or divergent?

for eg: in 1/n! applying alembers test we get infinity>1 so it ois convergent.

but on the other hand, the series like x+2x^2+3x^3……..to infinity is divergent if i apply the same test even though i am getting infinity in both of the cases.

how it works?

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