Let `f(r)=sum_(j=2)^2008 1/(j^r)=1/(2^r)+1/(3^r)+ .....+1/(200 8^r)*` Find `sum_(k=2)^oof(k)`

Let f(r) = sum_(j=2)^(2008) (1)/(j^(r)) = (1)/(2^(r))+(1)/(3^(r))+"…."+(1)/(2008^(r)) . Find sum_(k=2)^(oo) f(k)

Find sum_(r=1)^n (2r - 8)

Find sum_(r=1)^oo (-8) (-1/2)^r

Find: sum_(r=1)^oo (-8) (-1/2)^r

Let f(n)=sum_(r=1)^(n)r^(2)C_(r)^(2)* Then ,f(5)=

If f(r)=1+(1)/(2)+(1)/(3)+.......(1)/(r) and f(0)=0, then sum_(r=1)^(n)(2r+1)f(r)

sum_(r=1)^oo tan^-1((6^r)/(2^(2r+1)+3^(2r+1)))

Find sum_(r=1)^(10) (r+2)(3r+1).