(1/(1*6))+(1/(11*6))+(1/(11*16))+…+(1/(101*106)).
(1/(1*6))+(1/(11*6))+(1/(11*16))+…+(1/(101*106))．
<gadget id="calculator">1 / 106</gadget>
<output>1/106 = around 0.009434</output>

<gadget id="calculator">1 - (1/106)</gadget>
<output>105/106 = around 0.990566</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(105/106) * (1/5)</gadget>
<output>21/106 = around 0.198113</output>

<result>21/106 = around 0.198113</result>