re <span class="math display">\[ (x)_n=\frac{\Gamma(x+1)}{\Gamma(x-n+1)} \]</span></p>
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<p><code>real</code> <strong><code>lchoose</code></strong><code>(real x, real y)</code><br>
Return the natural logarithm of the generalized binomial coefficient
of x and y. For non-negative integer inputs, the binomial coefficient
function is written as <span class="math inline">\(\binom{x}{y}\)</span> and pronounced “x choose y.”
This function generalizes to real numb