(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.
xThe number of chooses from the set
nThe 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