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5 subsets of 4 and of 1, 10 subsets of 3 and of 2 adds up to 30.
For example, if we have a set of numbers called A which has 3 members(in our case numbers): A={2,5,6} this set has 8 subsets (2^3) which are as follow: the empty set: ∅ {2},{5},{6} {2,5},{2,6},{5,6} {2,5,6}
Only a set can have subsets. there is no set identified in the question.
natural numbers integers and whole numbers
{}, {1}, {2} and {1,2}