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U3 = ar² = 3/8
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r³ = 8/64 = 1/8
r = 1/2
ar² = 3/8
a*1/4=3/8
a = 3*4/8 = 3/2
U8 = ar⁷ = 3/2*1/(2^7) = 3/(2^8) = 3 /256