(1/3)+(1/15)…+(1/99)=
(1/3)+(1/15)…+(1/99)=
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">1 - (1/11)</gadget>
<output>10/11 = around 0.909091</output>

<gadget id="calculator">(1/2) * (10/11)</gadget>
<output>5/11 = around 0.454545</output>

<result>5/11 = around 0.454545</result>