Created Saturday 15 August 2020
Probability functions:
PROB='define fact(n) { p=1; while( n>1 ) { p*=n; n-=1 }; return p } define perm(m,n) { return fact(m)/fact(m-n) } define comb(m,n) { return perm(m,n)/fact(n) }' echo $PROB'perm(10,4)' | bc