Answer :
A) Yes; counterexample: Tripling 3 and adding one results in the number 10
B) No counterexample possible
C) No counterexample possible
D) No counterexample possible
E) Yes; counterexample: Squaring 7 results in the number 49
A) Yes; counterexample: Tripling 3 and adding one results in the number 10
B) No counterexample possible
C) No counterexample possible
D) No counterexample possible
E) Yes; counterexample: Squaring 7 results in the number 49