O P Malhotra, S K Gupta and, Anubhuti Gangal Solutions for Chapter: Sets, Exercise 3: Mental Maths

The set of even prime numbers written in Roster form is $\{$_____$\}$. 

The element of the set $A=\left\{m\mathit{/}m \mathrm{is} \mathrm{a} \mathrm{month} \mathrm{of} \mathrm{the} \mathrm{year} \mathrm{beginning} \mathrm{with} A\right\}$are $\_\_\_\_\_$

The cardinal number of the set $\mathrm{X}=\left\{x\mathit{/}x \mathrm{is} \mathrm{a} \mathrm{day} \mathrm{of} \mathrm{the} \mathrm{week}\right\}$ is _____.

The sets $\mathrm{A}=\left\{\mathrm{F}, \mathrm{E}, \mathrm{A}, \mathrm{R}\right\}$ and $\mathrm{B}=\left\{\mathrm{F}, \mathrm{A}, \mathrm{R}, \mathrm{E}\right\}$ are equal sets.

 $\mathrm{A}=\left\{\mathrm{set} \mathrm{of} \mathrm{multiples} \mathrm{of} 2\right\}$and $\mathrm{B}=\left\{\mathrm{set} \mathrm{of} \mathrm{multiples} \mathrm{of} 3\right\}$. Are $\mathrm{A}$ and $\mathrm{B}$: Disjoint Sets / Overlapping Sets?