Ω={(i,j)|1≦i≦4,1≦j≦35152−n}から

#A=4x(35152−n)−3x(35151−n)

  =6750−15n−6286+14n

  =35155−n

P(X)=(105465−3n)/(140608−4n)

105456 140596
8785 35149 

35131 140560