Lingling designed a plan for a "pricing prize" activity. If the probability of each student winning is (1/4), she first puts 2 "prize" notes into the box, and how many "no award" notes should be put into the box ．
玲玲设计了一个"摸奖"活动方案．如果要使每个同学获奖的可能性为(1/4)，她先往盒子里放进2张"有奖"的纸条，还要往盒子里放进多少张"无奖"的纸条．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / (1/4)</gadget>
<output>8</output>

<gadget id="calculator">8 - 2</gadget>
<output>6</output>

<result>6</result>