Question 2 (a)(adsbygoogle = window.adsbygoogle || []).push({});

how is it possible? B is a set (since A is a set), how can a set be an element of another set?

Rather than saying: B is an element of C

I thought it would be better to say: B is a subset of C.

Also, can someone explain question 2 (d) to me? thanks

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# How can B be an element of C?

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