Yes. It is incorrect without the definite article.
6 Şubat 2016
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Just a comment, you can't actually choose the *best* answer randomly. You could choose the winner randomly but not the best. As saying the best means you have evaluated all the answers and choose the best one based on it's merits.
6 Şubat 2016
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!