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ar² = 2
a = 2/r²
U₆ = 1/4
ar⁵ = 1/4
2r⁵/r² = 1/4
r³ = 1/8
r = ∛1/8
= 1/2
a = 2
1/2
= 4
maka,
U₈ = ar⁷
= 4(1/2)⁷
= 4 (1/128)
= 4/128
= 1/32
Jadi, suku ke 8 adlah 1/32