Question 1010523
 list all the subsets of set { pi, e ,r}. What are they ?
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No elements:: null set
1 element:: {pi},{e},{r}
2 elements:: {pi,e},{pi,r},[e,r}
3 elements:: {p,2,r}
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Notice that there are 2^3 = 8 subsets
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Cheers,
Stan H.