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Sets — MATHS STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceMATHSSets1 Mark
Question
When $\text{A}=\phi,$ then number of elements in P(A) is ______________.
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Answer

When $\text{A}=\phi,$ then number of elements in P(A) is 1.
Solution:
Here $\text{A}=\phi \therefore \text{n(A)}=0$
$\because \text{n}[\text{P(A)}]=2^{\text{n(A)}}=2^0=1$
Hence, the filler is 1.

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