1.

T_(n) =sum _( r =2n )^(3n-1) (r)/(r ^(2) +n ^(2)), S_(n) = sum _(r =2n+1)^(3n) (r )/(r ^(2) + n ^(2)), thenAA n in {1,2,3...}:

Answer»

`T_(n ) GT 1/2 LN 2`
` S_(n) LT 1/2 ln 2`
` T_(n) lt 1/2 ln 2`
` S_(n)gt 1/2 ln 2`

Answer :A::B


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