Setiap bakteri akan membelah diri menjadi 3 setiap 20 menit. Jika banyaknya bakteri mula mula berjumlah 18, maka banyak bakteri setalah 1 jam

<p>Jawaban yang benar adalah&nbsp;</p><p>C. 2 x 3⁵</p><p>&nbsp;</p><p>Yuks simak pembahasannya.......</p><p><strong>Cara manual</strong> :</p><p>Waktu : &nbsp; &nbsp;0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 20 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 40 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 60</p><p>Bakteri: &nbsp;18 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;54 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 162 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 486</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (2 x 3²) &nbsp; &nbsp;(2 x 3³) &nbsp; &nbsp;(2 x 3⁴) &nbsp; &nbsp; &nbsp;(2 x 3⁵)&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</p><p><strong>Cara kedua : Menggunakan rumus barisan geometri</strong></p><p>&nbsp;Rasio (r ) = 3</p><p>n = (60 menit : 20 menit) + 1</p><p>&nbsp; &nbsp; = 3 + 1</p><p>&nbsp; &nbsp; = 4</p><p>a = 18</p><p>&nbsp;</p><p>U_n= ar^n-1</p><p>U₄ = 18 x (3)^4-1</p><p>&nbsp; &nbsp; &nbsp; = 18 x 3³</p><p>&nbsp; &nbsp; &nbsp; = 2 x 3² x 3³</p><p>&nbsp; &nbsp; &nbsp; = 2 x 3⁵</p><p>Jawabannya : C</p>