 Usage:  ret = pdfbin (n, p, x)  
 
 Input:

  n                      scalar 
                         
  p                      scalar 
                         
  x                      m x 1 vector of integer numbers (0<=x<=n) 
                         
 Output:

  ret                    m x 1 vector of probabilities 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
