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contoh
1=(2x1)-1=1
2=4-1=3
3=6-1=5 dan seterusnya
b=3-1=2
Un=a+(n-1)b
Un=1+(n-1)2
Un=1+2n-2
Un=2n-1 ---->ini rumus suku ke n
misal
U7=2.7-1=14-1=13
U8=2.8-1=16-1=15
dst