Asked by Mary
Let A be a subset of U.
{null,{null}} - {null} =?
{null,{null}} - {null} =?
Answers
Answered by
Reiny
take a look how operations are defined in sets
https://www.probabilitycourse.com/chapter1/1_2_2_set_operations.php
https://www.probabilitycourse.com/chapter1/1_2_2_set_operations.php
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