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Răspuns:
[tex]b = \frac{1}{3} . \frac{3}{5} . \frac{5}{6} . \frac{4}{7} . \frac{3}{10} \frac{8}{11} \frac{15}{16} . \frac{20}{21} . \frac{24}{25} . \frac{27}{26} \frac{60}{77} . \frac{80}{81} . \frac{111}{101} [/tex]