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Eyad

  • 3 years ago

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

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  1. experimentX
    • 3 years ago
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    Sinf??

  2. Eyad
    • 3 years ago
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    Sum to infinity :D Its rule is S∞ =a/1-r .

  3. experimentX
    • 3 years ago
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    you should have written more explicitly

  4. Eyad
    • 3 years ago
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    what do u mean ?

  5. experimentX
    • 3 years ago
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    sum up to infinity

  6. Eyad
    • 3 years ago
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    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 ).

  7. Eyad
    • 3 years ago
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    lol ,thats all what I know xD

  8. Eyad
    • 3 years ago
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    I think its we can apply the rule only ..

  9. experimentX
    • 3 years ago
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    put n=2 ...

  10. experimentX
    • 3 years ago
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    1/r + 1 = 8

  11. experimentX
    • 3 years ago
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    find the value of a from the left relation

  12. Eyad
    • 3 years ago
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    u mean 1-r ,but why u put a =1 ?

  13. experimentX
    • 3 years ago
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    Oh ... sorry ... forgot to divide by 2

  14. experimentX
    • 3 years ago
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    ignore that post ... i wasn't thinking

  15. Eyad
    • 3 years ago
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    nvm :)

  16. Eyad
    • 3 years ago
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    sry for asking many questions :/

  17. experimentX
    • 3 years ago
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    \[ \frac{S_2}{T_2} = 4 = \frac{a +ar}{ar}\] find the value of r from here get the value of a from other relation

  18. Eyad
    • 3 years ago
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    aha...

  19. Eyad
    • 3 years ago
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    @satellite73 : can u help :)

  20. Eyad
    • 3 years ago
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    @experimentX :from where u got that 4 in Sn/Tn=4=... ?

  21. experimentX
    • 3 years ago
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    from your second relation ... put n=2

  22. Eyad
    • 3 years ago
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    oh, OK

  23. experimentX
    • 3 years ago
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    you will get the value of r from here use your first relation to get the second value

  24. experimentX
    • 3 years ago
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    *get the value of a

  25. Eyad
    • 3 years ago
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    oh ,k........TY ^.^_^.^

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