Sequence and series help! (1 Viewer)

[aanthnnyyy]

hey guys does anyone know how to prove the alternate form of limiting sum of an infinite series when |r|<1 using:
∞
Σ ar^k
k=0

I can't find this anywhere :/

 

[astroman]

is this what u mean?

 

[aanthnnyyy]

nah I'm talking about the one with sigma infinity k=0 ar^k if that makes any sense, I tried uploading the image but it's too big :/

 

[aanthnnyyy]

∞
Σ ar^k
k=0

 

[astroman]

this?

 

[aanthnnyyy]

ye but the other form using sigma :/

 

[astroman]

donno soz

 

[aanthnnyyy]

all good thanks for the help seems this stupid notation is not used at all