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The number of subsets = 256 
no. of proper subsets = 255

we find number of no of subset = 2^n, where n is the no. of elements in the set.

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To find number of no of subset =   2^{n}
where n is the no. of elements in the set.
The number of subsets = 2^{5} =  32
no. of proper subsets = total subsets - null set = 32 - 1 = 31
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