The feat "improved critical' stacks with keen weapons?

[T.T]

If i have 'improved critical' and hold a keen falchion, what would be the result for the threat range?

Falchion = 18-20
Falchion with Imp. Critical feat = 15-20
Falchion keen with Imp. Critical feat = 12-20

Is that true?

ty

=)

[voodoogroves]

No, it does not stack with keen.

[toughguyjoe]

For clarification- N O ! ! !

[T.T]

Ok. Ty!