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					<h3>78岁奶奶与13岁少年因旧信相逢，78与13的奇妙相遇暖人心</h3>



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						<span>2026-11-14 08:58:33</span>
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					<div class="content all-txt"><p>“78与13的奇妙相遇”指的是一个典型的组合数学问题：如果有13个人，每两个人只相遇一次，那么一共会产生78次两两相遇。计算方法是 <strong>13×12÷2=78</strong>。其中，13表示参与者总数，12表示每个人可以与其余12个人相遇，除以2则是为了消除重复计算。</p>

<h2>为什么13个人会产生78次相遇？</h2>

<p>关键在于明确“相遇”的统计对象。这里的一次相遇，不是指某个人参加了一场活动，而是指一组确定的两个人见面。例如，甲和乙相遇算一次，甲和丙相遇也算一次；但乙和甲的相遇不能再次单独计算，因为它与甲和乙是同一对人。</p>

<p>可以先从每个人的角度观察。13个人中的任意一人，都能与另外12个人分别相遇，因此初步计算为：</p>

<p><strong>13×12=156</strong></p>

<p>但这个结果把每一对人计算了两遍。甲和乙相遇时，从甲的角度看会记录一次，从乙的角度看也会记录一次；实际上，这仍然只是同一场两人相遇。所以要把156除以2：</p>

<p><strong>156÷2=78</strong></p>

<p>因此，13个人在“每两个人恰好相遇一次”的条件下，总共形成78组不同的两人组合，也就是78次两两相遇。</p>

<h2>按步骤计算时，为什么必须除以2？</h2>

<p>另一种更直观的方法，是按照人物出现的顺序逐步统计，避免重复记录。</p>

<ol>
  <li>第1个人可以与后面的12个人相遇，产生12次。</li>
  <li>第2个人不再和第1个人重复计算，只与后面的11个人相遇，产生11次。</li>
  <li>第3个人只与后面的10个人计算，产生10次。</li>
  <li>依次继续，直到第12个人与第13个人相遇，产生1次。</li>
</ol>

<p>把这些次数相加，就是：</p>

<p><strong>12+11+10+9+8+7+6+5+4+3+2+1=78</strong></p>

<p>这种方法揭示了78的来源：它不是一个孤立的数字，而是从12连续加到1得到的三角数。第一个人连接12个新对象，第二个人连接11个尚未计算的对象，后面每个人依次减少一个新的组合，直到最后只剩下1对。</p>

<p>如果把每个人与其他人的关系画成连线，13个人就是13个点，每两点之间连一条线。需要计算的其实是这些点之间一共有多少条连线。每条连线对应一对人，也对应一次独立的两两相遇。</p>

<h2>78与13之间，真正的规律是什么？</h2>

<p>从表面看，78等于13的6倍，但“78是13乘以6”并不是最完整的解释。6来自13减去1后再除以2，即：</p>

<p><strong>78=13×（13-1）÷2=13×6</strong></p>

<p>这里的“6”并不表示每个人只遇到6个人，而是因为每一对相遇在按个人统计时被重复看到了两次。先用13乘以12统计所有人的相遇记录，再通过除以2合并重复的正反方向，才得到真实的两人组合数。</p>

<p>用组合数表示，这个问题就是从13个人中任取2个人，计算不同取法的数量：</p>

<p><strong>C(13,2)=13!÷（2!×11!）=13×12÷2=78</strong></p>

<p>组合数中的“2”表示每组选择两个人。由于选择甲和乙，与选择乙和甲没有区别，所以顺序不影响结果。这正是两两相遇问题与排列问题的区别。</p>

<h2>如果人数改变，怎样快速算出相遇次数？</h2>

<p>把13换成任意人数n，只要仍然满足“每两个人只相遇一次”，就可以使用通用公式：</p>

<p><strong>相遇总次数=n×（n-1）÷2</strong></p>

<p>例如，5个人两两相遇时，次数为5×4÷2=10；10个人两两相遇时，次数为10×9÷2=45；20个人两两相遇时，次数为20×19÷2=190。</p>

<table>
  <caption>不同人数对应的两两相遇次数</caption>
  <thead>
    <tr>
      <th>人数</th>
      <th>计算式</th>
      <th>相遇次数</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>5人</td>
      <td>5×4÷2</td>
      <td>10次</td>
    </tr>
    <tr>
      <td>10人</td>
      <td>10×9÷2</td>
      <td>45次</td>
    </tr>
    <tr>
      <td>13人</td>
      <td>13×12÷2</td>
      <td>78次</td>
    </tr>
    <tr>
      <td>20人</td>
      <td>20×19÷2</td>
      <td>190次</td>
    </tr>
  </tbody>
</table>

<p>从这个公式还能看出，相遇次数不会随着人数简单地按同样倍数增长。人数增加1时，新增加的这个人会与原有所有人各相遇一次，因此新增次数等于原来的人数。比如从13人增加到14人，就会新增13次相遇，总数从78次变为91次。</p>

<h2>什么情况下可以使用78这个结果？</h2>

<p>78这个答案建立在几个明确条件之上。第一，参与者必须是13人；第二，统计的是两个人组成的组合；第三，每一对人只计算一次；第四，不考虑相遇的先后顺序；第五，默认每个人都与其他所有人完成相遇。</p>

<p>如果同一对人见面两次，那么第二次是否计入，要看题目统计的是“不同配对”还是“实际发生的见面次数”。若统计不同配对，甲和乙仍然只算一组；若统计实际见面次数，第二次见面也需要单独记录，此时总数就可能超过78。</p>

<p>如果一次活动中有3个人同时见面，也不能直接把它当成一次两两相遇。三个人在同一场活动里包含甲乙、甲丙、乙丙三组两人关系，因此按两两配对计算，应对应3组组合。类似地，若题目统计的是会议场次、活动场次或小组数量，就需要先确认统计单位，不能直接套用78。</p>

<p>所以，“78与13的奇妙相遇”真正展示的是一种从具体场景提炼数学结构的方法：13个人之间共有78组不同的两人组合。只要抓住“每两个人配成一组”这一核心，便能通过逐步相加、重复消除或组合公式，稳定地得到同一个答案。</p></div>
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