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6 8
2
bawah : 2A=2 ---> A=2/2=1
tengah: 3A+B=6--->B=6-3=3
atas : A+B+C=6 --->C=6-3-1=2
An²+Bn+C
n²+3n+2
Un=1/(n(n+3)+2)
A).
U10=1/(10(10+3)+2)=1/(10(13)+2)=1/132
U100=1/(100(100+3)+2)=1/(100(103)+2)=1/10302
B) Un=1/(n(n+3)+2)