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2015-06-04T20:18:54+08:00

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I assume the question asks for the formula for finding the number of subsets in a set.

This is the formula for finding the number of subsets in a set.

         2^{n(A)}
             - n(A) means number of elements in A.

Ex.  
        A = {a, b, c}
There are 3 elements, so   2^{3} = 8 subsets all in all
Proof:
Subsets:     B = {a}   C = {b}  D = {c}  E = {a, b}    F= {a, c}    G = {b,c}
                   H = {a, b, c}   I = { }

(Though, you can just make the formula,  2^{n} where n is the number of elements in the set)

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