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suku ke 20: 102
b=5
a.mencari suku ke 8
Un=U1+(n-1)b
U8=-3+(8-1)5
=-3+7*5
=-3+35=33.
b.mencari suku ke 20
Un=U1+(n-1)b
U20=-3+(20-1)5
=-3+19*5
=-3+95=92.