Using rules from both Group I and Group II, construct a deduction to prove that the following is valid.1. P ? (Q & R) (Premise)2. R ? (S v T) (Premise)/? ~(~P v S) ? T
What will be an ideal response?
3. ~P v (Q & R) 1, IMPL
4. ~P v (R & Q) 3, COM
5. (~P v R) & (~P v Q) 4, DIST
6. ~P v R 5, SIM
7. P ? R 6, IMPL
8. P ? (S v T) 2,7, CA
9. P ? (~S ? T) 8, IMPL
10. (P & ~S) ? T 9, EXPORT
11. (~~P & ~S) ? T 10, DN
12. ~(~P v S) ? T 11, DEM
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