If 2! =2*3, 3! =3*4*5, 6! =6*7*8*9*10*11, then: ((4i)/(5i))=How much?
如果2！=2*3，3！=3*4*5，6！=6*7*8*9*10*11，那么：((4i)/(5i))=多少？
<gadget id="calculator">4 * 5 * 6 * 7</gadget>
<output>840</output>

<gadget id="calculator">5 * 6 * 7 * 8 * 9</gadget>
<output>15_120</output>

<gadget id="calculator">840 / 15_120</gadget>
<output>1/18 = around 0.055556</output>

<result>1/18 = around 0.055556</result>