Question: Please Explain the answer. 4. The QRT guarantees that any integer n can be written in one of the forms: 3q, 3:; + 1 ,
Please Explain the answer.

4. The QRT guarantees that any integer n can be written in one of the forms: 3q, 3:; + 1 , and 3g + 2 tor some integer q. Prove that n2 is of the form 3k or 3k + 1 for some integer k
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