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Question

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


A

8

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B

7

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C

6

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D

5

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Solution

The correct option is B

7


A set of n elements has 2n subsets.
Every set is a subset of itself.
Thus, the number of proper subsets of a set is 2n1 subsets.
The set {1,2,3} has 3 elements and hence, 231=7 proper subsets.


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