(1/(1*3))+(1/(3*5))+(1/(5*7))+(1/(7*9))+…+(1/(31*33) )+(1/(33*35)).
(1/(1*3))+(1/(3*5))+(1/(5*7))+(1/(7*9))+…+(1/(31*33))+(1/(33*35))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 35</gadget>
<output>1/35 = around 0.028571</output>

<gadget id="calculator">1 - (1/35)</gadget>
<output>34/35 = around 0.971429</output>

<gadget id="calculator">(1/2) * (34/35)</gadget>
<output>17/35 = around 0.485714</output>

<result>17/35 = around 0.485714</result>