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r = -4/2 = -2
Un = a r^(n-1)
Un = 2 (-2)^(n-1)
b a = 160
r = 80/160 = 1/2
Un = ar^(n-1)
= 160 (1/2)^(n-1)
r=-2
Un=ar^n-1
Un= 2*-2^n-1
Un=-4^n-1