If $A = {1, 2, 3}$ , then the numbers of subsets of set $A$ is

24

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28

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8

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16

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Solution

The correct option is C $8$
The set ${1, 2, 3}$ has $8$ subsets. The first subset would be the null or empty subset, which contains none of the numbers: ${}$ .
The null set is a subset of every set. The other subsets would include some of the numbers in the set, but not all of them: ${1}$ , ${2}$ , ${3}$ , ${1, 2}$ , ${1, 3}$ , ${2, 3}, {1, 2, 3}$

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The number of proper subsets of the set {1, 2, 3} is ___.

U = {4, 8, 12, 16, 20, 24, 28}, A = {8, 16, 24}, B = {4, 16, 20, 28}

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U = {4, 8, 12, 16, 20, 24, 28}, A = {8, 16, 24}, B = {4, 16, 20, 28}

(A \cap B)^{'} = A^{'} \cup B^{'}

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