If `t_r=r/(4r^4+1),then sum_(r=1)^oot_r` is equal to

sum_(r=1)^(n) r.r ! is equal to

sum_(r = 1)^(n) r. r! is equal to

sum_(r=1)^n r (n-r +1) is equal to :

sum_(r=1)^n r (n-r +1) is equal to :

If T_r=r(r^2-1), then find sum_(r=2)^oo1/Tdot

If T_r=r(r^2-1), then find sum_(r=2)^oo1/Tdot

If T_r=r(r^2-1), then find sum_(r=2)^oo1/T_rdot

(sum_(r=1)^n r^4)/(sum_(r=1)^n r^2) is equal to

let the rth term of the series is given by tr=(r)/(1+r^(2)+r^(4)) then lim_(n rarr oo)sum_(r=1)^(n)t_(r) is equal to: ( A) (1)/(2)(B)1(C)2(D)(1)/(4)