I'm 21 and hold two condition insurance policies. Which is primary?

I'm 21 and am a full time student, so I am still covered under my father's plan (NYS Empire Plan PPO - United Healthcare). I also work full time and now enjoy coverage through my job (Empire Blue Cross Blue Shield EPO). Which one would become my primary?
"> well im not to sure something like it to be honest, mine is the same way but i construe that the coverage through your job becomes your primary


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