what is the inverse.......if you are a teenager then you are not 25 years old

Mathematics
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if you are not 25 years old then you are a teenager

if you are not a teenager then you are 25 years old

if you are 25 years old then you are not a teenager

if you are not a teenager then you are not 25 years old 

Oct 3rd, 2015

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if you are not 25 years old then you are a teenager

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Sep 18th, 2015

the answer is wrong


Sep 18th, 2015

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Oct 3rd, 2015
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Oct 3rd, 2015
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