Find the law and calculate: (1/2)+(1/6)+(1/12)+(1/20)+...+(1/9900)=how much.
找规律计算：(1/2)+(1/6)+(1/12)+(1/20)+…+(1/9900)=多少．
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1 - (1/100)</gadget>
<output>99/100 = around 0.99</output>

<result>99/100 = around 0.99</result>