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Un=arⁿ⁻¹
no.1
r=U2/U1=8/16=1/2
U8=16x(1/2)⁷=16x(1/28)=1/8
no.2
r=20/100=1/5
U6=100x(1/5)⁵=100/3125=0.032
no.3
r=5/1=5
U8=1x(5)⁷=78125
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