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  3. prove the following using the method suggested: (a

Prove the following using the method suggested: (a) Prove the following either by direct proof or...

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Basic Math

Prove the following using the method suggested:
(a) Prove the following either by direct proof or bycontraposition:
Let a ? Z, if a ? 3 (mod 5) and b ? 2 (mod 5), then ab ? 1 (mod5).

(b) Prove the following by contradiction:
Suppose a, b ? Z. If a² + b²
is odd, then (2|a) ? (2|b), where ? is the exclusivedisjuntion,
i.e. p ? q = (p ? q) ? ¬(p ? q).

(d) Prove the following by cases: For all n ? Z,n
2 + 3(n + 1) is odd.

(e) Prove the following by induction:
For n ? 1,
1 × 2 + 2 × 3 + 3 × 4 + · · · + n(n + 1) = n/3
(n + 1)(n + 2)

Answer & Explanation Solved by verified expert
3.9 Ratings (527 Votes)
a Given a b Z and a 3 mod 5 and b 2 mod 5 ie a 3 is divisible by 5 and b 2 is divisibleby 5b Given p q p q p q ie if p is true then q is false and if pis false then q true Hence p q is true only if both of p and q do    See Answer
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