Question: Using Natural Deduction, prove the following are valid arguments: 3 . ( D&E ) - > F , D& F E 4 . D ,

Using Natural Deduction, prove the following are valid arguments:
3.(D&E)-> F, D&F E
4.D, B ->(C D), C -> D B
5. Q ->(P -> R) P ->(Q -> R

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