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This is an old version, <a href="https://mc-stan.org/docs/functions-reference/real-valued_basic_functions.html#betafun">view current version</a>.
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<h2><span class="header-section-number">3.13</span> Combinatorial Functions</h2>
<!-- real; inc_beta; (real alpha, real beta, real x); -->
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<p><code>real</code> <strong><code>inc_beta</code></strong><code>(real alpha, real beta, real x)</code><br>
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