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C) is correct answer = 0
as,
The cardinal number for an empty set is zero. Example: Let C = {#, $, %, &}. Show n(C) = 4. Hence, C is equivalent to {1, 2, 3, 4} and n(C) = 4 since a 1-1 correspondence can be setup between C and {1, 2, 3, 4}.
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0 is the cardinal number of null set
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