A fraction, the numerator is the smallest prime number, and the denominator is the largest odd number within 20. What is the fraction?
一个分数，分子是最小的质数，分母是20以内的最大的奇数，这个分数是多少．
<gadget id="calculator">2 / 19</gadget>
<output>2/19 = around 0.105263</output>

<result>2/19 = around 0.105263</result>