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u5=ar^4=162
2.r^4=162
r^4=81
r=3
u4=ar^3
2.3^3
2.27
u4=54
b.
u3=ar^2
4.r^2=64
r^2=16
r=4
u4=ar^3
4.4^3
u4=256
c.
u7=ar^6
3,5 x r^6 = 224
r^6=64
r=2
u4=ar^3
3,5 x 2^3
3,5 x 8
u4=28