n = 240/3 = 8
Un = a x r^n
U8 = 100 x 2^8
= 25.600
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n = 240/3 = 8
Un = a x r^n
U8 = 100 x 2^8
= 25.600
Kelas : IX SMP
Bab : Barisan dan Deret
Pembahasan :
4 jam = 4 x 60 menit = 240 menit
n = 240 menit / 30 menit
n = 8
Barisan Geometri
Un = ar^n
U8 = 100(2)^8
U8 = 25600 bakteri