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suku ke6 = 96 . Tentukan lah rasio dan suku pertama
JAWAB
U4 = ar³ = 24
U6 = ar^5 = 96
maka
⇨ U6/U4 = 96/24
⇨ ar^5/ar³ = 96/24
⇨ r² = 4
⇨ r = 2
masukkan nilai r ke U4 maka
⇨ ar³ = 24
⇨ a(2)³ = 24
⇨ a×8 = 24
⇨ a = 24/8
⇨ a = 3
Jadi rasio = 2 dan suku pertama = 3