Calculation: (2/3)*(3/4)*(4/5)*...*(48/49)*(49/50)=how much.
计算：(2/3)*(3/4)*(4/5)*…*(48/49)*(49/50)=多少．
<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">2 * (1/50)</gadget>
<output>1/25 = around 0.04</output>

<result>1/25 = around 0.04</result>