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u4 = ar³ = 64
u4 : u2 = r² = 16
r = √16
r = 4
ar = 4
a = 1
u7 = ar⁶
= 1 x (4)⁶
= 3096
-------- = r^2
u2=ar
r^2=64/4
r^2=16
r=4
a=1
u7=ar^6
u7=4^6
u7=4096