# Math

posted by Mark

1) a) Decide if (q  ( p~ q))~ p is a tautology using propositional equivalence and the
laws of logic.
b) Prove that the following argument is valid:
q
q r
p r
p
~
_________
~

c) Replace p, q and r in 1b) by statements and construct an argument.

No clue how to even start. Thank you

1. mwlevin

Many of the symbols aren't showing up. Try rewriting using ∧ and ∨, or & and |.

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