B Nirmala Shastry Solutions for Exercise 2: EXERCISE 7.2

Check whether $\left\{-12, -11, -10, -9, \dots , 17, 18, 19, 20\right\}$ is an infinite set.

Check whether $\{x:x$ is a multiple of $17\}$ is a finite set.

If $A$ and $B$ are equal sets, then $A$ and $B$ are also equivalent sets.

If $R$ and $S$ are null sets, then $R$ and $S$ are equal sets.

$A=\{x:x$ is an odd number $\le 7\}, B=\{x:x$ is a prime number $<10\} \therefore A=B$

$\{x:x$ is an even number less than $3\}=\{x:x$ is an integer between $1$ and $3\}$

If $X=\{$vowels of English language$\}$, then $n\left(X\right)=5$

If $X=\{$set of all natural numbers less than $1\}$, then $n\left(X\right)=0$