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8 = U₁ . r³
8 = U₁ .
8 = U₁ . 729/8
U₁ = 8 × 8/729
=
b) 162 = U₁ . r⁴
6 = U₁ . r¹
6 = U₁ . 3
U₁ = 6/3 = 2