If a set $A$ has $n$ elements, then the total number of subsets of $A$ is
$n$
${n^2}$
${2^n}$
$2n$
(c) Number of subsets of $A{ = ^n}{C_0}{ + ^n}{C_1} + ………{ + ^n}{C_n} = {2^n}$.
List all the elements of the following sers :
$B = \{ x:x$ is an integer $; – \frac{1}{2} < n < \frac{9}{2}\} $
Let $S=\{1,2,3,4\}$. The total number of unordered pairs of disjoint subsets of $S$ is equal to
$E = \{ x:x$ is a month of a year not having $ 31 $ days ${\rm{ }}\} $
Examine whether the following statements are true or false :
$\{a\} \subset\{a, b, c\}$
Are the following pair of sets equal ? Give reasons.
$A = \{ x:x$ is a letter in the word ${\rm{FOLLOW }}\} $
$B = \{ y:y$ is a letter in the word $WOLF\} $
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