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How many elements does each of these sets have where a and b are distinct elements? (with steps please)

a) P({a,b{a,b}})

b)P({∅,a,{a},{{a}}})

c)P(P(∅))

*i have tried to solve them but i am a little bit confused...

Thanks in advance :)

a) P({a,b{a,b}})

b)P({∅,a,{a},{{a}}})

c)P(P(∅))

*i have tried to solve them but i am a little bit confused...

Thanks in advance :)

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