The school's red scarf radio station needs to select a male and female host from among 3 boys and 4 girls. Xiaodong is one of the boys. If everyone has the same probability of being selected, what is the probability of Xiaodong being selected?
学校红领巾广播台要在3名男生和4名女生中挑选男女主持人各一名，小东是男生中的一个，如果每人选中的可能性相等，那小东被选中的可能性是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>