Question
A number when divided by 7 gives remainder 3. Find remainder when its square is divided by 7.
Answer: n=7k+3 ⇒ n²=49k²+42k+9=7(...)+2. Remainder 2.
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Question
Answer: n=7k+3 ⇒ n²=49k²+42k+9=7(...)+2. Remainder 2.
Question
Answer: n=7k+3 ⇒ n²=49k²+42k+9=7(...)+2. Remainder 2.