JEE Main 2026 (Online) 21st January Morning ShiftQuestion 1
The number of relations, defined on the set $\{a,b,c,d\}$, which are both reflexive and symmetric, is equal to :
Sets, Relations and Function
Solution
Diagonal pairs are forced; each of the $\binom42=6$ unordered off-diagonal pairs is in or out together. Count $=2^6=64$.