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<p>Return <em>the probability that the </em><code>n<sup>th</sup></code><em> person gets his own seat</em>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> n = 1
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<strong>Output:</strong> 1.00000
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<strong>Explanation: </strong>The first person can only get the first seat.</pre>
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<p><strong>Example 2:</strong></p>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> n = 2
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