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Either yapılabilir or yapılabilen are correct but their types are different, so using styles are different.
You can use yapılabilir as an adjective used with a noun and also without a noun. So you can use it like this:
Bu proje yapılabilir.
This project is able to be done/is possible to be done/is feasable 
But yapılabilen needs always a noun. You can't use it itself. Example:
Bu, şu an yapılabilen bir proje.
This is a project which is able to be done now.
And a note:
Maronin wrote one letter wrong. It must be "yapılabilirlik"
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