The TV station surveyed 100 people about watching TV the day before. 62 people watched channel 2, 34 people watched channel 8, and 11 people watched both channels. How many people haven't watched either channel?
电视台向100人调查前一天收看电视的情况，有62人看过2频道，34人看过8频道，11人两个频道都看过．有多少人两个频道都没有看过？
<gadget id="calculator">34 - 11</gadget>
<output>23</output>

<gadget id="calculator">62 + 23</gadget>
<output>85</output>

<gadget id="calculator">100 - 85</gadget>
<output>15</output>

<result>15</result>