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Determinati cardinalele multimilor:
a) A={x€Z | x<100, |x|=x}
b) B={x€Z | 100<|x|<200}


Răspuns :

A={0, 1, 2,....99}, deci cardA=100
B={-199, -198, ...-101, 101, 102, ...199}, deci cardB=198