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math subsets

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what is the proper subset for 13, 14, 15

  • math subsets - ,

    If A={13,14,15}
    A proper subset B of A is such that
    B∈A but B≠A.
    The following sets are all proper subsets of A:
    ∅, {13}, {14}, {15}, {13,14}, {13,15}, {14,15}

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