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Q.

The number of all possible proper subsets of ${2, 3, 5}$ is

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a

3!

b

7

c

3

d

8

answer is C.

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Detailed Solution

Given set

A =

{2, 3, 5}

Here $n (A) = 3$

Number of all possible sub-sets $= 2^{n} - 1 = 2^{3} - 1 = 7$

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