Q. The complement of the union of two sets is the intersection of their complements and the complement of the intersection of two sets is the union of their complement. These are called ...X... laws. Here, X refers to

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Solution:

The complement of the union of two sets is the intersection of their complements and the complement of the intersection of two sets is the union of their complements. These are called De-Morgan's laws. These are named after the Mathematician De-Morgan.