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even though its carnality is 0 one of its properties says that the only subset of the null set is the empty set

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Carnality refers to sexual desires and I would be greatly surprised if the null set had any of those!

The number of subsets of a set whose cardinality is C(S) is 2C(S).

The cardinality of the null set is, as the answer was trying to say, 0. So the number of its subsets is 2C(S) = 20 = 1.

A null set has one subset - which is also a null set.

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Q: How many subsets are in a Null set?
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