Find all the subsets of {p : p is a letter in the word 'poor'} .
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C = {p, o, r}
If a set has n elements, the number of subsets = 2n.
Here the set has 3 elements, the number of subsets = 23 = 2 x 2 x 2 = 8.
Subsets of B are ϕ, {p}, {o}, {r}, {p, o}, {o, r}, {r, p}, {p, o, r}.
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