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OpenStudy (amistre64):
Let A={{},a}, if B is the set of all subsets of A, what is the cardinality of AuB?
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OpenStudy (amistre64):
Im thinking: B={{}, {a} , {{},a} } AuB = {} , a , {}, {a} , {{},a} , and since duplication of elements us superfluous n(AuB) = 4
OpenStudy (amistre64):
... im wrong of course
OpenStudy (amistre64):
and i know why too, can anyone spot my fauxpaux?
OpenStudy (amistre64):
my setB is missing an element ...
OpenStudy (anonymous):
is it empty set? does it count? and what about {} isnt it empty set already?
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OpenStudy (mertsj):
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