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U1 = a = 3/5
U2 = -1/5
r = U2/U1
r = -(1/5)/(3/5)
r = -(1/5)x(5/3)
r = - 5/15
r = -1/3
Un = a.r^(n-1)
= (3/5)x(-1/3)^(n-1)
= (-3/15)^(n-1)
= -(1/5)^(n-1)