sentences: )In the case when the variables formula_1 are independent and identically distributed with cumulative probability distribution function formula_10 for all "i" the theorem reduces to 
  
  
  Glueck et al.note that the Bapat–Beg "formula is computationally intractable, because it involves an exponential number of permanents of the size of the number of random variables" However, when the random variables have only two possible distributions, the complexity can be reduced to O("m"2"k").