If the cardinal number of the set $A$ is $1$ , then the cardinal number of the power set $P (A)$ is:

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Solution

The correct option is B $2$
Let cardinal no. of $A = n = 1$
Cardinal number of the power set $= 2^{n}$
Then, power set $P (A) = {1, ϕ}$
Hence, cardinal number of power set $P (A) = 2$ .

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