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U2 = ar = - 6
ar^4 = 162
ar - 6
r³ = - 27 = (-3)³
r = -3
jadi rasionya r = -3
U5= 162 itu ar4=-162
= -6/r r4= 162
= -6r3 = -162
r3 = -162/6
r3 = -27
r = -3