n = 40/4 = 10
Un = a.r^n
U10 = 5 x 2^10
= 5120
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n = 40/4 = 10
Un = a.r^n
U10 = 5 x 2^10
= 5120
Matematika SMP kelas IX
a = 5
n = 40 menit : 4 = 10
r = 2
jumlah bakteri = a x (rⁿ⁻¹) x r
jumlah bakteri = 5 x (2¹⁰ - 1) x 2
jumlah bakteri = 10 x 512
jumlah bakteri = 5.120 bakteri