A) \[{{2}^{x-y}}\frac{{{2}^{y-1}}}{{{2}^{x-1}}}\]
B) \[{{2}^{x-y}}\frac{{{2}^{y}}-1}{1-{{2}^{x}}}\]
C) \[\frac{{{2}^{x}}+{{2}^{y}}}{{{2}^{x}}-{{2}^{y}}}\]
D) \[{{2}^{x+y}}\frac{{{2}^{y}}+1}{{{2}^{x}}+1}\]
E) None of these
Correct Answer: B
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