If 7 different balls are distributed to two people so that each person gets at least 2 balls, how many different methods are there?
把7个两两不同的球分给两个人，使得每个人至少分得2个球，则不同的分法共有多少种．
<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<gadget id="calculator">128 - 2 - 14</gadget>
<output>112</output>

<result>112</result>