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a = 35
r = 2
Dit :
banyaknya bakteri setelah 2 jam ?
2 jam = 2 x 60 menit = 120 menit
120/20 = 6 » n = 6 + 1 = 7
Un = a.r^(n - 1)
U7 = 35.2^(6)
U7 = 35 x 64
U7 = 2.240 bakteri