(3/5)*(1/7)*(6/13)+(5/7)*(1/5)*(3/13)+(1/13)*(3/7)*(2 /5).
(3/5)*(1/7)*(6/13)+(5/7)*(1/5)*(3/13)+(1/13)*(3/7)*(2/5)．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">(3/5) * (1/7) * (6/13)</gadget>
<output>18/455 = around 0.03956</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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

<gadget id="calculator">3 / 13</gadget>
<output>3/13 = around 0.230769</output>

<gadget id="calculator">(5/7) * (1/5) * (3/13)</gadget>
<output>3/91 = around 0.032967</output>

<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/13) * (3/7) * (2/5)</gadget>
<output>6/455 = around 0.013187</output>

<gadget id="calculator">(18/455) + (3/91) + (6/455)</gadget>
<output>3/35 = around 0.085714</output>

<result>3/35 = around 0.085714</result>