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a = 30 r = 2 n =
Un = a x
10.15=30
dit: pukul 12.00=?
dij: 12.00 -10.15 = 105 menit
105 menit= 15 menit × 7
7×2=14
30+14=44
jadi banyak bakteri pada pukul 12.00 adalah 44