A positive integer is of the form $3 q+1, q$ being a anatural number. Can you write its square in any form other than $3 m+1,3 m$ or $3 m+2$ for some integer $m ?$ Justify your answer.
Question:
A positive integer is of the form $3 q+1, q$ being a anatural number. Can you write its square in any form other than $3 m+1,3 m$ or $3 m+2$ for some integer $m ?$ Justify your answer.
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