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The general formula of 1-1. - 1-1?
a2=1-1/a1=1-1/(1/2)=1-2=-1a3=1-1/a2=1-1/(-1)=1+1=2a4=1-1/a3=1-1/2=1/2………… The number sequence starts from the first term, according to 1 / 2, - 1,2,1 / 2, - 1,2 The general formula of sequence is: an = 1 / 2 (n = 3K + 1, K ∈ n) - 1 (n = 3K + 2, K ∈ n) 2 (n = 3K + 3
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