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let A={12, 13, 14,15,16,18 } what is the subset of a
A has how many subset
B has ------ subset

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    I think you are missing part of your question for B.

    A can be a subset of itself, so it would include everything

    The null or empty set is also a subset.

    Each number could be in its own subset.

    We are up to 8 subsets.

    Also, we could take two numbers at a time to make unique subsets you would use combinations to do that. 6!/(2!4!)

    Then you could take three numbers at a time: 6!/(3!3!)

    Then you could take four numbers at a time: 6!/(4! 2!)

    Finally, you could take five numbers at a time: 6!(5!1!)

    Sum all of these and you will get the total number of subsets for A.

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