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U5 = 162 ( bukan 167 )
~~~~~~~~ ÷
r^(7-5) = 1.458/162
r² = 9
r = √9
r = 3
U5 = 162 ( bukan 167)
U5 = a x r⁴
162 = a x 3⁴
a = 162/81
a = 2