Subtract its (1/2) from 2011, then subtract the remaining (1/3), then subtract the remaining (1/4), ... and finally subtract the remaining (1/2011), what is the difference?
将2011减去它的(1/2)，再减去余下的(1/3)，再减去余下的(1/4)，…最后减去余下的(1/2011)，差是多少．
<gadget id="calculator">1 / 2_011</gadget>
<output>1/2_011 = around 0.000497</output>

<gadget id="calculator">2_011 * (1/2_011)</gadget>
<output>1</output>

<result>1</result>