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dik=b=17-14=3
U1=14-3=11
n=20
dit=U20?
penyelesaian=
Un=U1+(n-1)b
U20=11+(20-1)3
U20=11+57
U20=68
semoga membantu
sory kalau salah
= 11 + 19.3
= 11 + 57
= 68