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An Infinite Geometric sequence Such : \[S \infty =81/2 , Sn/Tn=(3^n-1)/2\] ,Find The G.s ???

Mathematics
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Sinf??
Sum to infinity :D Its rule is S∞ =a/1-r .
you should have written more explicitly

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Other answers:

what do u mean ?
sum up to infinity
An infinite geometric series is an infinite series whose successive terms have a common ratio. Such a series converges if and only if the absolute value of the common ratio is less than one ( | r | < 1 ).
lol ,thats all what I know xD
I think its we can apply the rule only ..
put n=2 ...
1/r + 1 = 8
find the value of a from the left relation
u mean 1-r ,but why u put a =1 ?
Oh ... sorry ... forgot to divide by 2
ignore that post ... i wasn't thinking
nvm :)
sry for asking many questions :/
\[ \frac{S_2}{T_2} = 4 = \frac{a +ar}{ar}\] find the value of r from here get the value of a from other relation
aha...
@satellite73 : can u help :)
@experimentX :from where u got that 4 in Sn/Tn=4=... ?
from your second relation ... put n=2
oh, OK
you will get the value of r from here use your first relation to get the second value
*get the value of a
oh ,k........TY ^.^_^.^

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