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9,3,1,(1)/(3),(1)/(9),"…."...

`9,3,1,(1)/(3),(1)/(9),"…."`

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Here, `a=9`
and `r=(3)/(9)=(1)/(3)=((1)/(3))/(1)=((1)/(9))/((1)/(3))="..."=(1)/(3) i.e.a=9,r=(1)/(3)`
Decreasing GP `(agt0,0 lt r lt 1)`
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