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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
r = U2/U1
r = 128/256
r = 1/2
U11 = a . r¹⁰
U11 = 256 . (1/2)¹⁰
U11 = 256 . 1/1.024
U11 = 1/4
U₂ = 128
Dan,
U₁₁ = 2⁹⁻¹¹
= 2⁻²
= ¼