1) What is the Contrapositive form of P⇒Q a) ∼P ⇒ ∼Q b) ∼Q⇒P c) Q⇒∼P d) ∼Q⇒∼P 2) What is the definition of the congruence of numbers? a) a and b are congruent modulo n if n|(a-b) b) a and b are congruent modulo n if a|(n-b) c) a and b are congruent modulo n if b|(a-n) 3) 6≅4 mod 10 a) True b) False 4) 2≅14 mod 4 a) False b) True 5) 20≅7 mod 6 a) True b) False 6) 17≅-4 mod 4 a) True b) False

Proof By Contrapositive and Congruence of Integers

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