65,5-2,5xX=34,5

2,5xX=65,5-34,5

2,5xX=31

X=31:2,5

X=12,4

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Y = \(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\) 

   = \(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}+\frac{1}{16}-\frac{1}{32}=1-\frac{1}{32}=\frac{31}{32}\)

=> Y = \(\frac{31}{32}=1-\frac{1}{32}\) < \(1-\frac{1}{2004}=\frac{2003}{2004}\) = B