Find the sequence 0,1,0,1 The general term formula of

an=0.5*(-1)^n+0.5

Sequence - 2,1,6,13 A general formula of is

x²-3

Sequence 1,1 / 2,3 / 7,2 / 5,5 / 13 A general formula of is?

a(1)=1=1/(3×1-2)
a(2)=1/2=2/4=2/(3×2-2)
a(3)=3/7=3/(3×3-2)
a(4)=2/5=4/10=4/(3×4-2)
a(5)=5/13=5/(3×5-2)
a(n)=n/(3n-2)

Write a general term formula of sequence of numbers, 1 / 2, 1 / 6, 1 / 12

an=-[（-1）^n]/[n*(n+1)]

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