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<p>Community colleges are relatively inexpensive, so extra semesters at a community college cost a lot less than extra semesters at a four year school (an extra semester at a state university might cost as much as two to four extra semesters at a community college). So they may be a good choice for students who need a lot of remedial course work, or who are likely to take longer than four semesters to decide on a major and become ready to transfer to a four year school for four semesters of upper division work.</p>