Question

# The number of proper subsets of the set $$\left\{1,2,3\right\}$$ is

A
8
B
7
C
6
D
5

Solution

## The correct option is A 7Number of proper subsets of the set $$\left\{1,2,3\right\}={2}^{3}-1=7$$ $$\left\{\phi\right\}$$,$$\left\{1\right\}$$,$$\left\{2\right\}$$,$$\left\{3\right\}$$,$$\left\{1,2\right\}$$,$$\left\{2,3\right\}$$,$$\left\{1,3\right\}$$Maths

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