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Bab Barisan dan DeretMatematika SMP Kelas VIII
geometri
a = 16
r = 3/2
Sn = (a x (rⁿ - 1)) / (r - 1) = 211
16 x ((3/2)ⁿ - 1) / (3/2 - 1) = 211
16 x ((3/2)ⁿ - 1) : 1/2 = 211
32 x ((3/2)ⁿ - 1) = 211
(3/2)ⁿ - 1 = 211/32
(3/2)ⁿ = 211/32 + 1
(3/2)ⁿ = 211/32 + 32/32
(3/2)ⁿ = 243/32
(3/2)ⁿ = (3/2)⁵
n = 5
banyaknya suku adalah 5