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240 ÷ 30 = 8 ⇒ (n-1)
rumus geometri = a × r pangkat (n-1)
= 25 × 2 pangkat 8
= 25 × 256
= 6400 bakteri
240 : 30 = 8
berarti carinya u9
U9 = 25 x 2 ^8
=25 x 256 = 6400