https://bugs.freedesktop.org/show_bug.cgi?id=51083

--- Comment #3 from Werner <[email protected]> ---
This bug additionally affects the functions B, CritBinom and NegBinomDist.

In these functions the precision is bad when pow(1-p,n) is a denormalized
number.
If pow(1-p,n) is zero an alternative using pow(p,n) is used.

For double, 
  numeric_limits<double>::min() = 2.22507e-308
  numeric_limits<double>::denorm_min() = 4.94066e-324
  0.2^462 = 9.88131e-324
so 0.2^462 has nearly no significant digits.

Changed to select the calculation method depending on size of p, see
https://gerrit.libreoffice.org/1213

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