[Fsf-friends] Which license should I use?

[Kushal Das]

Hi,
I am making an application which is actually a combination of different 
packages. Now the problem is these packages are of diffrent licenses like :
GPL, LGPL, MIT, MPL.

Now I am confused in which license my application should be released ?
And whether it is at all required to have a license for my application or not?

Regards,
Kushal
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