(PECL stats >= 1.0.0)
stats_stat_binomial_coef — Returns a binomial coefficient
stats_stat_binomial_coef ( int $x , int $n ) : float
Returns the binomial coefficient of n choose x.
x
The number of chooses from the set
n
The number of elements in the set
Returns the binomial coefficient
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https://www.php.net/manual/en/function.stats-stat-binomial-coef.php