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Verified answer
Jumlah bakteri = 25lama waktu membelah diri = 4 x 60 = 240 menit
jumlah akhir bakteri setelah 4 jm = = 600 bakteri
4 jam = 4 x 3
= 12
Maka
S₁₂ = a ( r ⁿ - 1 ) / ( r - 1 )
S₁₂ = 25 ( 2¹¹ - 1 ) / ( 2 - 1 )
S₁₂ = 25 ( 2047 )
S₁₂ = 51.175 bakteri