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Assume that a and b are positive integers. Which of the following statements must be true?

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If a is divisible by b, then a is divisible by b squared.

Correct Answer: 
No

If a squared is divisible by b, then a is divisible by b.

Correct Answer: 
No

If a is divisible by b squared, then a is divisible by b.

Correct Answer: 
Yes

If a squared is divisible by b squared, then a is divisible by b squared.

Correct Answer: 
No