Find total number of subsets of {p : p is a letter in the word 'poor'}

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Solution

Set $=$ { $p, o, r$ }
Any set $B$ is a subset of a set $A$ if $A$ contains all the elements of $B$ .
Hence, all the Subsets of the given set are $ϕ, {p}, {o}, {r}, {p, o}, {p, r}, {o, r}, {p, o, r}$

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