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Find 1+(1)/(2)+(1)/(4)+(1)/(8)+.... upto...

Find `1+(1)/(2)+(1)/(4)+(1)/(8)+....` upto `oo`.

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Here, `a=1, r=1/2" "` So, `" " S_(oo)=a/(1-r)=1/(1-1/2)=2`
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