discrete math, Mathematics

Assignment Help:
) Show that the following argument is valid:

(~p ? q) => r
s ? ~q
~t
p => t
(~p ? r) => ~s
------------------------
? ~q


2) Show that the following argument is valid:

r => p
~w ? r
(t ? q) => p ? s
q ? w
~p
~r => t
------------------------
? s

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