(1/3) of the students in a certain class participated in the science and technology interest group, and (2/5) of the students in another class participated in the sports interest group. What is the total number of students in the class who did not participate in these two interest groups?
某班学生的(1/3)参加了科技兴趣小组，另有班级学生的(2/5)参加了体育兴趣小组，问没有参加这两个兴趣组的学生是班级总人数的多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>