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U7 --> ar^6 = 1.458
ar^2 × r^4 = 1.458
18 × r^4 = 1.458
r^4 = 81
r = 3
a × 3^2 = 18
a × 9 = 18
a = 2
U5 --> ar^4
= 2 × 3^4
= 162