(1+(1/51))*(1-(1/51))*(1+(1/52))(1-(1/52))*...*(1+(1/152)) *(1-(1/152))=how much.
(1+(1/51))*(1-(1/51))*(1+(1/52))(1-(1/52))*…*(1+(1/152))*(1-(1/152))=多少．
<gadget id="calculator">50 / 51</gadget>
<output>50/51 = around 0.980392</output>

<gadget id="calculator">153 / 152</gadget>
<output>153/152 = around 1.006579</output>

<gadget id="calculator">(50/51) * (153/152)</gadget>
<output>75/76 = around 0.986842</output>

<result>75/76 = around 0.986842</result>