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Verified answer
4 jam = 60 × 4 = 240 menit.240 ÷ 15 = 16
20×16 = 320 bakteri
a = 20
4 jam/15 menit = 240/15 = 16
a x r^(16-1) = 20 x 2^15 = 20 x 32768 = 655360
Jumlah bakteri : 655360