Which of the following is a good definition?


A: You are a teenager if and only if you are 15 years old.

B: You are 15 years old if and only if you are not an adult.

C: You are 13 to 19 years old if and only if you are a teenager.

D: You are not a teenager if and only if you are less than 13 years old.

My choice is C

3 answers

I agree.
Thank you very much!
You're welcome.
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