Tính biểu thức dưới đâu: (1 - 1/2) x (1 - 1/3) x (1 - 1/4) x (1 - 1/5) x (1 - 1/6) x ( 1 - 1/7)

\[\left( {1 - \frac{1}{2}} \right) \times \left( {1 - \frac{1}{3}} \right) \times \left( {1 - \frac{1}{4}} \right) \times \left( {1 - \frac{1}{5}} \right) \times \left( {1 - \frac{1}{6}} \right) \times \left( {1 - \frac{1}{7}} \right)\]

\[ = \frac{1}{2} \times \frac{2}{3} \times \frac{3}{4} \times \frac{4}{5} \times \frac{5}{6} \times \frac{6}{7} = \frac{1}{7}.\]