Question

select the correct answer.
what is a counterexample to this claim?
all perfect squares are even
a. 4
b. 9
c. 16
d. 36

Explanation:

A counterexample disproves the claim "All perfect squares are even" by being an odd perfect square. First, identify each option's parity:

• 4 = 2², even
• 9 = 3², odd
• 16 = 4², even
• 36 = 6², even

9 is a perfect square but odd, so it disproves the claim.

Answer:

B. 9