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r = 960 : 640 = 1,5
n = 5
Un = ar^n-1
U5 = 640×1,5^5-1
U5 = 640 × 1,5^4
U5 = 640 × 5,0625
U5 = 3240
penduduk pada tahun 2017 sebanyak 3240 orang. maaf kalau salah