Give an example of sets A,B and C which simultaneously satisfy the given property. A is an element of B,?

(question continued). B is an element of C . and A is not an element of C

Give an example of sets A,B and C which simultaneously satisfy the given property. A is an element of B,?
A={a}, B={{a}} , C= {{{a}}}
Reply:42.
Reply:a=3, b=6, c=4

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