If is a positive integer then the values of for which cannot be a perfect square are
If is a positive integer then the values of for which cannot be a perfect square are
Solution
✅ Correct Option: 3
Find which residues a perfect square can leave when divided by .
Check squares of modulo :
Possible residues of a perfect square mod : .
Residues and are impossible.
Since , the values of for which can never be a perfect square are exactly those giving impossible residues:
and
Answer and
Related questions:
IPMAT Indore 2023
IPMAT Indore 2019
IPMAT Indore 2023
IPMAT Indore 2025
IPMAT Indore 2025
IPMAT Indore 2026