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Which is more important the ugpa or grad gpa, because my graduate gpa is much higher than my ugpa?

Your LSDAS GPA, which is calculated with all college grades received before being awarded your first bachelor's degree. Schools may look at your grad GPA if it's down to you and an identical candidate, but the LSDAS GPA is very important while your grad GPA is not important, so don't get your hopes up there.

Your grad GPA doesn't matter at all. It is only your LSDAS GPA that matters.