<prompt> Acha m circ n fracmnmn4. Kokotoa cdots2005 circ 2004 circ 2003 circ cdots circ 1 circ 0.  <response>: Kumbuka kuwa m circ 2 m22m4 frac12, kwa hivyo kiasi tunachotaka kupata ni frac12 circ 1 circ 0 frac13 circ 0 frac112. 