Let $A=\{1,2,3,4\}$. Answer questions 21 to 23. the number of relations in A which are reflexive and

Question

Let $A=\{1,2,3,4\}$. Answer questions 21 to 23. the number of relations in A which are reflexive and symmetric is

Professor PC Thomas Classes · Answer

Number of reflexive and symmetric relation is $2^{\frac{\mathrm{n}(\mathrm{n}-1)}{2}}$