Tính biểu thức sau: B = (1 - 1/2) x (1 - 1/3) x (1 - 1/4) x ... x (1 - 1/100)

\[A = \left( {1 - \frac{1}{2}} \right) \times \left( {1 - \frac{1}{3}} \right) \times \left( {1 - \frac{1}{4}} \right) \times ...\left( {1 - \frac{1}{{100}}} \right)\]

\[ = \frac{1}{2} \cdot \frac{2}{3} \cdot ... \cdot \frac{{99}}{{100}} = \frac{1}{{100}}.\]