r = U2 ÷ U1
r = 6/18 = 1/3
Suku ke-6
Un = arⁿ-¹
U6 = (18 × 1/3)⁶-¹
U6 = 18 × (1/3)⁵
U6 = 18 × 1/243
U6 = 18/243
U6 = 6/81
U6 = 2/27
Jawaban:
D. 2/27
Penjelasan dengan langkah-langkah:
a atau u1 = 18
u2 = 6
r = u2/u1 = 6/18 = 1/3
Un = a×r^(n-1)
U6 = 18×1/3^(6-1)
U6 = 18×1/3^5
U6 = 18×3^-5
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r = U2 ÷ U1
r = 6/18 = 1/3
Suku ke-6
Un = arⁿ-¹
U6 = (18 × 1/3)⁶-¹
U6 = 18 × (1/3)⁵
U6 = 18 × 1/243
U6 = 18/243
U6 = 6/81
U6 = 2/27
Jawaban:
D. 2/27
Penjelasan dengan langkah-langkah:
a atau u1 = 18
u2 = 6
r = u2/u1 = 6/18 = 1/3
Un = a×r^(n-1)
U6 = 18×1/3^(6-1)
U6 = 18×1/3^5
U6 = 18×3^-5
U6 = 18/243
U6 = 2/27