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[" 13.If "t(r)=(r)/(4r^(4)+1)" ,then "su...

[" 13.If "t_(r)=(r)/(4r^(4)+1)" ,then "sum_(r=1)^(oo)t_(r)" is equal to "],[[" (A) "1/2," (B) "1/3],[" (C) "1/4," (D) "1/5]]

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