In a ratio, the product of two inner terms is the smallest prime number. It is known that one outer term is (1/2) and the other outer term is.
在一个比例中，两个內项的积是最小的质数，已知一个外项是(1/2)，另一个外项是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / (1/2)</gadget>
<output>4</output>

<result>4</result>