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Verified answer
Geometria = 81
r = U2/U1
= 27/81
= 1/3
Un = a . r^(n - 1)
U8 = 81 . 1/3^(8 - 1)
U8 = 81 . 1/3^7
U8 = 81 . (3^(-1))^7
U8 = 81 . 3^-7
U8 = 81 . 1/3^7
U8 = 81/2187
U8 = 1/27
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