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

     .2687742319

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

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

    1.3675666854