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b. 50.000
un. 1.500.000
un=a(n-1)b
1.500.000=500.000+(n-1)50.000
1.500.000=500.000+50.000n-50.000
1.500.000-500.000+50.000=50.000n
1.050.000=50.000n
1.050.000/50.000=n
21=n
jadi D 21