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概略です

 P_(n)=-(1/6)・P_(n-1)+(1/6) より

 特性方程式を解き、

  P_(n)-(1/7)=-(1/6){P_(n-1)-(1/7)}

●P_(n)-(1/7)を、公比 -(1/6)の等比数列と考え

  P_(1)=0 から、初項P_(0)-(1/7)=-1/7

 P_(n)-(1/7)=(-1/7)・(-1/6)ⁿ⁻¹ より

     P_(n)=(1/7)+(-1/7)・(-1/6)ⁿ⁻¹

     P_(n)=(1/7){1-・(-1/6)ⁿ⁻¹}

という感じです

華恋〔かれん〕

ありがとうございます!!

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