4 is quardratic residue of 7. A. True B. False I had been asked

4-is-quardratic-residue-of-7-a-true-b-false-i-had-been-asked

4 is quardratic residue of 7.

A. True

B. False

I had been asked this question during an internship interview.

This intriguing question originated from Number Theory topic in chapter Number Theory and Cryptography of Discrete Mathematics

Correct option is A. True

Best explanation: Since 25 ≡ 4(mod)7, 4 is quardratic residue of 7.