One special prize, 3 first prizes, 10 second prizes, 80 third prizes and 200 encouragement prizes are placed in a lottery box. What are the chances of getting the grand prize?
一个抽奖箱里放特等奖1个，一等奖3个，二等奖10个，三等奖80个，鼓励奖200个．摸到特等奖的可能性是多少．
<gadget id="calculator">1 + 3 + 10 + 80 + 200</gadget>
<output>294</output>

<gadget id="calculator">1 / 294</gadget>
<output>1/294 = around 0.003401</output>

<result>1/294 = around 0.003401</result>