Bakteri E.coli

<p>Diketahui :</p><p>a = 30</p><p>r = 2</p><p>4 jam : 30 menit = 240 menit : 30 menit = 8</p><p>n = 8 + 1 = 9</p><p>&nbsp;</p><p>U_n = ar^{n - 1}</p><p>U₉ = 30.(2)^9-1</p><p>&nbsp; &nbsp; &nbsp; = 30.(2)⁸</p><p>^{&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;}= 30(256)</p><p>^{&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;}= 7.680</p><p>Jadi jumlah bakterio setelah 4 jam adalah 7.680 bakteri</p><p>&nbsp;</p><p><strong>Cara manual </strong>:</p><p>Waktu &nbsp; &nbsp; &nbsp; Mula-mula &nbsp; &nbsp; &nbsp; &nbsp; 30 &nbsp; &nbsp; 60 &nbsp; &nbsp; 90 &nbsp; &nbsp;120 &nbsp; &nbsp;150 &nbsp; &nbsp; 180 &nbsp; &nbsp; &nbsp;210 &nbsp; &nbsp; &nbsp; &nbsp;240</p><p>J. Bakteri &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;30 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;60 &nbsp; 120 &nbsp; 240 &nbsp; 480 &nbsp; &nbsp;960 &nbsp; 1.920 &nbsp; 3.840 &nbsp; &nbsp;<strong>7.680</strong></p><p>&nbsp;</p>