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add leetcode problem-cn part3

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算法题（国内版）/problem (Chinese)/第 N 个神奇数字 [nth-magical-number].html Normal file
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<p>一个正整数如果能被 <code>a</code> 或 <code>b</code> 整除，那么它是神奇的。</p>
<p>给定三个整数 <code>n</code> ,&nbsp;<code>a</code> , <code>b</code> ，返回第 <code>n</code> 个神奇的数字。因为答案可能很大，所以返回答案&nbsp;<strong>对&nbsp;</strong><code>10<sup>9</sup>&nbsp;+ 7</code> <strong>取模&nbsp;</strong>后的值。</p>
<p>&nbsp;</p>
<ol>
</ol>
<p><strong>示例 1：</strong></p>
<pre>
<strong>输入：</strong>n = 1, a = 2, b = 3
<strong>输出：</strong>2
</pre>
<p><strong>示例&nbsp;2：</strong></p>
<pre>
<strong>输入：</strong>n = 4, a = 2, b = 3
<strong>输出：</strong>6
</pre>
<p>&nbsp;</p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 &lt;= n &lt;= 10<sup>9</sup></code></li>
<li><code>2 &lt;= a, b &lt;= 4 * 10<sup>4</sup></code></li>
</ul>
<p>&nbsp;</p>