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Bab Barisan dan DeretMatematika SMP Kelas VIII
Geometri
r = U2 : U1
= 960 / 640
= 3/2
2007, 2008, 2009, 2010, 2011, 2012
2012 = U6
U6 = a x r⁵
= 640 x (3/2)⁵
= 640 x (243/32)
= 20 x 243
= 4.860 jiwa
a = 640
ar = 960
r = =
Pertanyaan:
U6 = ?
Jawab:
Un = ar⁽ⁿ⁻¹⁾
U6 = 640.⁽⁶⁻¹⁾
⇔ 640.⁵
⇔ 640. = 4.860
Jadi, jumlah penduduk pada tahun 2012 sejumlah 4.860 jiwa.