Question

anyone pls help me.....​

Answer 1

15 elements. There are only two improper subsets—phi and the whole set itself[Mendelson's Introduction to Topology, published 1963, page 5]. So, elements in power set is 2^(4) which includes all the subsets. Therefore, number of proper sets must be 2^(4) - 2.

Answer 2

Answer:

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