Question

Check my work please? Two questions?

Answer 1

(1) Which bioconditional is NOT a good definition?
a. A whole number is odd if and only if the number is not divisible by 2.
b. An angle is straight if an only if its measure is 180 degrees.
c. A whole number is even if and only if it is divisible by 2.
d. A ray is a bisector if and only if it splits the angle into two angles.

My answer: (a)

Answer 2

(2) One way to show that a statement is NOT a good definition is to find a ___?
a. converse
b. conditional
c. bioconditional
d. counterexample

My answer: (d)