44 characters, changed $k,$n into $_[0] and pop, changed while to for loop. Removed semicolon a the end. 
sub bc { 
$r=1;$r*=$_/($_[0]-$_+1)for(1+pop..$_[0]);$r
}

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In reply to Re: binomial coefficient by Anonymous Monk
in thread binomial coefficient by Anonymous Monk

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