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r = 1/2
Un= a X r^n-1
Un = 32 X (1/2)^n-1
Un = 32 X 1^n-1/2^n-1
Un = 32 X 1/2^n/2^1
Un = 32 X 1X2^1/2^n
Un = 32 X 2/2^n
Un = 64/2^n
Un = 2^6/2^n
Un = 2^6-n