請問一題統計問題

[icrtstyle (開始懂了)]

   A communications syatem consists of n components,each of which will ,

   independently,function with probability P.The total system will be able

   to operate effectively if at least one-half of it's components function

   (a)For what value of p is a 5-componant system more likely to operate

      effectively than a 3-component system ?

   (b)In general, when is a 2k+1 component system better than 2k-1

      component system ?

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