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1/50 1/2=1/(1^2+1) 1/3=1/(2^2-1) 1/10=1/(3^2+1) 1/15=1/(4^2-1) . 第n個數=1/(n^2+(-1)^(n+1))(-1的n+1次方) =1/50 第7個數=1/(7^2+1) =1/50
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