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Question Number 66439 by Rio Michael last updated on 15/Aug/19

$f o r a g e o m e t r i c s e r i e s .$ $c a n t h e s u n t o i n f i n t y u s e t h e t w o f o r m u l a s$ $S_{\infty} = \frac{a}{1 - r} ∣ r ∣ < 1 a n d S_{\infty} = \frac{a}{r - 1} ∣ r ∣ > 1 ? ? p l e a s e i a m g e t t i n g c o n f u s e d o n t h i s .$
Commented byJDamian last updated on 15/Aug/19

$T h e s u m w h e n n \to \infty a n d r > 1 i s \pm \infty$
Commented byRio Michael last updated on 15/Aug/19

$s o i t c a n b e u s e d ? i m e a n t h e s e c o n d f o r m u l a$
Commented byKunal12588 last updated on 15/Aug/19

$w h e n t h e s e r i e s i s c o n v e r g i n g t h o s e f o r m u l a s$ $c a n b e u s e d$
Commented byRio Michael last updated on 15/Aug/19

$t h a n k s$
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