(1/(1*4))+(1/(4*7))+(1/(7*10))+(1/(10*13))+…+(1/(97*100) ).
(1/(1*4))+(1/(4*7))+(1/(7*10))+(1/(10*13))+…+(1/(97*100))．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<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>

<gadget id="calculator">(1/3) * (99/100)</gadget>
<output>33/100 = around 0.33</output>

<result>33/100 = around 0.33</result>