he binomial coefficient "N choose K", written
 
          ( N )         N!    
          (   )   =  --------
          ( K )      K!(N-K)!
 
    with a little imagination for the left-hand side notation.  
 
    N and K can each either be an array or a scalar, and must of course
    be the same size if they are both arrays. 
 
    Usage: b=<a href="choose.html">choose</a>(n,k);
    __________________________________________________________________
    This is part of <a href="jLab.html">JLAB</a> --- type 'h