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Question: exercise 1 without the use of truth tables investigate whether...

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Exercise 1. Without the use of truth tables, investigate whether the argument below is valid. Label (document) your steps Exercise 2. Show that this argument is valid. Document all your steps Br(C(z) V-B()) (C(P) ·3x(P(z) v-B(z)) Exercise 3. Let a be a nonzero rational number, and y be an irrational number. Prove, by contradiction, that ry fQ (i.e. ry is irration Exercise 4. Let n N. Prove that if n+2n is divisible by 3 then (n +1)+2(m +1) is also divisible by 3.
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