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Do i need to submit the recommendations for applying to inst?

Yes. University of Pennsylvania requires to submit the recommendations to its applicants. The next table summarizes the application requirements at University of Pennsylvania.
Application Requirements
University of Pennsylvania
SAT Test Score
ACT Test Score
High School GPA
High School Rank
High School Record
Completion Of College-preparatory Program
Recommendations
Formal Demonstration Of Competencies
TOEFL (Test Of English As A Foreign Language)
Other Test (Wonderlic, WISC-III, Etc.)
Required △ Considered (not Required) ✓ Recommended ✗ Neither Required nor Recommended

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