Question 1139524

Valid.

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Here is the proof:

1.  A --> B & C
2.  B v D --> E
3.:: A         Conditional Proof (CP) assumption
4.:: B & C     3,1  Modus Ponens (MP)
5.:: B         4 Simplification (SIMP)
6.:: B v D     5 Addition (ADD)
7.:: E         6,2 MP
8.  A --> E    3-7 CP