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a(n)=3*2^(n-1)-2 證明(1)當n=1時a(1)=3*2^(1-1)-2=1符合題設 (2)假設當n=k時a(k)=3*2^(k-1)-2成立 則a(k+1)=a(k)*2+2=3*2^(k)-2成立 所以對於任意正整數n a(n)=3*2^(n-1)-2均成立
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