(36/62)^8+(36/62)^8+(52/62)^8-(26/62)^8-(26/62)^8-(10/62)^8

##</code><code>##

     .2687742319

##</code><code>##

 
  (1 - p) + 2 (1 - p) p + 3 (1 - p) p^2 + 4 (1 - p) p^3 + ...  =

  (1 - p) (1 + 2 p + 3 p^2 + 4 p^3 + ...)                      =

   1 - p
   -----  (p + 2 p^2 + 3 p^3 + 4 p^4 + ...)                    =  
     p

   1 - p     p           1
   -----  ------ 2  =  -----
     p    (1 - p)      1 - p

##</code><code>##

    1.3675666854