Total number of subset of a set

The total number of subset of a set is “two to n”, (2^n), which is an exponential function of the cardinality of a given set.

More detailed explanation can be found under the referred link:
http://math.stackexchange.com/questions/546414/what-is-the-proof-that-the-total-number-of-subsets-of-a-set-is-2n/546450#546450

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