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U6=ar^5=160
ar×r^4=U6
10×r^4=160
r^4=160/10
r^4=16
r= akar pangkat 4 dari 16
r=2
U2=ar
10=2a
a=10/2
a=5
U10=ar^(10-1)
=ar^9
=5×2^9
=5×512
=2.560