Double Majoring in UCs/USC as a First Year Applicant

<p>I apologize if this is the wrong thread to post this in, I wasn't sure where else it might go. </p>

<p>I was hoping to double-major in one of the UCs (I think I'm applying to most if not all of them) but am not certain as to how I might go about this. I was searching online and it seems as though each of the UCs has different policies regarding their requirements for double-majoring.
That being said, I was wondering if as a general rule I have to send in supplements to both departments I would be attempting to get into if I were to double-major? And if I am interested in several programs in one department, would I be allowed to apply for all those that interest me, mostly as a safety (knowing that some will certainly reject me)?</p>

<p>The same questions apply to USC, I'm so confused with the common-app/all my applications right now so any help at all is appreciated!</p>

<p>Hope no one minds if I bump this ^^</p>